3 Ways To Make a TV Antenna Amplifier
By Robert Jones · 2022-02-13
Fed up with a patchy TV signal? Pixellated pictures and dropping channels are a real pain. I'll walk you through sorting out your reception, from choosing the right amplifier to even having a go at building your own, if you're feeling brave.
Right, so you're having a bit of a mare with your TV signal, eh? Flicks and pixellation, dropped channels, the works. Happens to the best of us, especially if you're a fair way from the transmitter or buried amongst big buildings. You're thinking, "How can I boost this rubbish signal?" Well, an antenna amplifier might be just what you need, but before you rush out and splash cash, let's talk about how you can sort one out, even build a simple one yourself if you're feeling a bit handy. **Quick Verdict: Don't always reach for an amp first; good aerials and cabling save more headaches.** ### Who it's for: * Folks with a genuinely weak-but-present signal. * Anyone splitting their aerial feed to multiple TVs. * People who've optimised their aerial setup but still need a little lift. ### Who should skip it: * Anyone with no signal at all – you need a better aerial or line of sight. * Those with obvious aerial damage or rotten cabling. * People living in strong signal areas – you're just adding noise for no reason.  *3 Ways To Make a TV Antenna Amplifier — tested in the SpeakersMag workshop.* ## Is an Amplifier What You Actually Need? Before we get our soldering irons out, let's be proper engineers about this. An amplifier makes a signal *stronger*, right? Sounds simple. But it also amplifies *noise*. If your signal is already crap, weak, and full of interference, an amp just makes that crap stronger and more noticeable. It's like turning up a really bad recording – still sounds bad, just louder. What you want is a clean signal, amplified. ### Weak Signal vs. No Signal Big difference. If you're getting *no* signal, or it's breaking up constantly, the problem is often your aerial itself. Is it pointing correctly? Is it damaged? Is the cable knackered? I've seen plenty of blokes swear their TV was broken, only for me to find a seagull had decided their rooftop aerial was a prime perch, bending it all out of shape. Or water's got into the co-ax connector. An amp won't fix that. If you've got a *weak* signal – meaning you get some channels, but they often pixelate, particularly in bad weather, or certain channels drop out – *then* an amplifier could well help. It bumps up the signal strength to overcome losses in your cabling or when splitting the signal to multiple TVs. ### The Golden Rule: Aerial First Honestly, I can't stress this enough. If your aerial isn't up to scratch, you're fighting a losing battle. A decent, high-gain aerial pointed spot-on at the transmitter is worth ten cheap amps. If you're struggling with signal, first check: * **Aerial condition:** Any damage? Loose elements? Rust? * **Positioning:** Is it pointing straight at the transmitter? Use an online tool or a compass. Sometimes moving it just a foot can make a world of difference. I've seen customers spend fifty quid on an amp only to find out their aerial had twisted slightly in the wind. A five-minute tweak and job done. * **Cabling:** Good quality co-ax cable (CT100 or WF100 is what you want, not the cheap stuff from the pound shop). Are the connectors tight and weatherproof? Water ingress is a killer for signal. A bit of silicone grease on outdoor connections goes a long way. Believe me, I've pulled enough waterlogged cable out of lofts over the years. Only once you're sure your aerial setup is as good as it can be, then you start thinking about an amplifier. ## What Types of Amplifiers Are There? Broadly speaking, you've got two main types of TV signal amplifiers, and it's important to know the difference. Both do the same basic job – boost the signal – but where they sit in your setup matters massively. ### Masthead Amplifier (or "Mast Amp") These are cracking bits of kit, usually fitted right up on the aerial mast itself, or as close as physically possible to the aerial. The idea is to boost the signal *before* it travels down a long run of cable. Why? Because the cable itself causes signal loss. The longer the run, the more you lose. If you amplify the signal right at the source, you're making sure the best possible signal starts its journey into your house. * **Pros:** Gets the purest signal boost, minimises signal degradation from cable length. * **Cons:** Needs outdoor fitting, usually requires a power supply unit (PSU) indoors that sends power up the co-ax cable. Can be a faff to install if you're not keen on ladders. * **Who it's for:** Folks a long way from the transmitter, or with very long cable runs to multiple TVs. I've fitted loads of these over the years, mainly for people in rural areas or big old houses where the aerial cable has to snake for twenty metres or more. A good masthead like a Vision V20-100 (around £30-£40) can make a night-and-day difference. ### Distribution Amplifier (or "Booster") These are what most people think of when they hear "TV amplifier." They sit indoors, usually near your TV or where your aerial cable first enters the house. They take the signal that's already come down the cable and boost it, often splitting it out to several TV points around the house. * **Pros:** Easy to install, just plug and play for the most part. Great for splitting the signal. * **Cons:** Amplifies any noise that's already been picked up or lost in the cable run *before* it gets to the booster. If your signal's already weak from a long cable run, this won't fix that initial loss. * **Who it's for:** Those with a decent signal entering the house but need to split it to 2, 4, or even 8 TVs, or to overcome minor signal loss within the house wiring. You'll find these everywhere, from Argos to Screwfix. Brands like Labgear, SLX, and One For All make perfectly serviceable ones. A basic 2-way booster is about £15-£25. Just make sure you get one with the right number of outputs for your needs. ## Making Your Own Amplifier: A DIY Dabble (If You're Brave!) Now, I wouldn't usually recommend building your own TV amplifier from scratch unless you've got a bit of electronics know-how. Commercial ones are cheap enough and designed properly. But, if you're feeling like a proper tinkerer and want to understand how they work, or just fancy a project, there are a couple of simpler ways to "make" or improve your signal without buying a ready-made box. ### Method 1: The "Passive Signal Combiner" Trick (Not a true amplifier, but can improve perceived signal) This isn't an amplifier in the sense of adding power to the signal, but it's a clever way to improve reception if you're getting reflections or interference from different directions. Sometimes, you're getting two signals – one direct, one reflected – arriving slightly out of phase, causing cancellation and breakup. Two aerials can sometimes help here. #### What you need: * Two identical Freeview aerials (yes, two!). * A passive TV signal combiner (often just called a mixer, around £5-£10). * Two short runs of good quality co-ax cable. * Mounting hardware for the second aerial. #### How to "make" it work: 1. **Mount your first aerial** as optimally as possible, pointing directly at the main transmitter. Get the best signal you can from this one alone. 2. **Mount the second aerial** nearby. Now, here's the tricky bit: you want to experiment with its position and direction. Try pointing it slightly off-axis from the first, or even in a completely different direction if you suspect reflections. The aim is to pick up a *complementary* signal, not just another weak one. 3. **Connect each aerial** to one input of the passive combiner with a short co-ax run. 4. **Connect the output of the combiner** to your main aerial cable running into the house. The combiner literally mixes the two signals. If you get the positioning right, the two signals can sometimes reinforce each other, cancelling out some noise or filling in gaps. It's a bit hit-and-miss, I'll admit, but I've seen it rescue a dodgy signal in some really awkward spots without needing any power. It's more about optimising signal path than brute-force amplification. Worth a shot if you've got spare aerials lying around. ### Method 2: Boosting with an Existing Satellite Dish (If you're *really* skint and have a spare LNB) Right, this is a proper bodging job, and it's not for everyone. But if you've got an old Sky dish on the wall that's no longer in use, and an old LNB (the bit on the end of the arm that points at the dish) kicking about, you can actually use the LNB's built-in low-noise amplifier (LNA) to boost a terrestrial TV signal. This requires a bit of understanding about power over co-ax. #### What you need: * An old satellite dish and LNB (universal or Sky mini-dish type). * A "F-type" to co-ax adapter (very common, few quid). * A satellite receiver or a powered satellite switch (e.g., a simple 2-way switch that provides 12V or 18V power to the LNB). * Your existing terrestrial TV aerial cable. #### How to "make" it work: 1. **Mount the LNB:** You'll need to rig up your terrestrial TV aerial so its tip is *pointing directly into the feed horn* of the LNB. Yes, that's right. You're using the LNB as a sensitive, low-noise pre-amplifier for your terrestrial signal. The dish itself is doing nothing here, it's just a handy mount for the LNB. 2. **Power the LNB:** An LNB needs power to work (usually 12V or 18V DC). You provide this power by connecting the LNB to a satellite receiver (even an old dead one can work if it still puts out power) or a dedicated powered satellite switch. The power travels up the co-ax cable to the LNB. 3. **Connect to TV:** The output from the satellite receiver/switch then feeds into a standard Freeview box or directly into your TV's aerial input. This is crude, but it works surprisingly well. The LNA in a standard LNB provides about 50-60dB of gain, which is a massive boost. It's not optimised for terrestrial frequencies, but often it's good enough to pull in a weak signal. I've seen this setup work wonders for people in very deep fringe areas who just wanted to get basic Freeview and couldn't afford a proper masthead. Again, it's a proper bodge, but it can get you out of a bind. **Warning:** Be very careful with any outdoor electrical setup. Ensure connections are weatherproof and safe. If in doubt, get a qualified aerial installer. ### Method 3: Modifying a Commercial Amplifier (for the brave and technically minded) This isn't about building one from scratch, but rather optimising a cheap off-the-shelf amplifier. Sometimes you buy a cheap booster, and it's too noisy, or the gain isn't quite right. With a bit of soldering skill, you can sometimes improve it. #### What you need: * A basic, cheap indoor distribution amplifier (e.g., a £10-£15 one). * Basic electronics tools: soldering iron, solder, small side cutters, multimeter. * Some small capacitors and resistors (you'll need to know your way around component values). * A decent signal meter (or a TV with a reliable signal strength display). #### How to "make" it better: 1. **Open it up carefully:** Most cheap boosters are in plastic cases. Crack it open. 2. **Identify key components:** Look for the main amplifier chip. It'll often be a small, multi-pin integrated circuit (IC). 3. **Reduce noise/optimise gain:** This is where the real skill comes in. You might find that the input stage has poor filtering, letting in more noise. Replacing small electrolytic capacitors with higher quality, lower ESR (Equivalent Series Resistance) ones can sometimes help. Adding small ceramic capacitors across the power supply pins of the IC can reduce ripple and noise. Adjusting feedback resistors around the amplifier stage can alter the gain, though this is much trickier and risks instability. 4. **Shielding:** Sometimes, the PCB itself isn't well shielded. Lining the inside of the plastic case with aluminium foil (and grounding it to the circuit's ground plane if possible) can reduce external interference. Honestly, this is for experts only. The cost of decent components and your time will quickly outweigh the cost of a better commercial amplifier. But as a learning exercise, or if you've got a box of components and nothing else to do on a rainy Sunday, it can be quite satisfying if you pull it off. I've tweaked a few cheap amps in my time, more for the fun of it than anything else. You're rarely going to beat a purpose-built unit, but you can definitely learn a lot. ## Choosing the Right Commercial Amplifier: What to Look For If you're going down the sensible route of buying one, here's what to consider. Don't just grab the cheapest or the one with the biggest "boost" number on the box. * **Gain (dB):** This is how much it amplifies the signal. Too little, and it's useless. Too much, and you can overdrive your TV tuner, causing distortion or even blocking out signals altogether. For masthead amps, 10-20dB is usually plenty. For distribution amps, 8-15dB per output is common. More isn't always better. You want *just enough* to overcome losses. * **Noise Figure (dB):** This is crucial. It tells you how much noise the amplifier itself adds to the signal. Lower is better. A noise figure of 2dB or less is excellent. Anything over 4dB starts getting a bit dodgy, especially for masthead amps where you want the cleanest possible signal upfront. * **Number of Outputs:** If it's a distribution amp, how many TVs do you need to feed? 2-way, 4-way, 8-way are common. Each split causes signal loss, which the amp compensates for. * **Frequency Range:** Make sure it covers the full UHF TV band (470-790 MHz for Freeview in the UK, although older installations might still be looking at up to 862 MHz). If you're using it for DAB radio too, check it covers that band (174-230 MHz) as well. * **Filtering:** Some amplifiers have built-in LTE/4G/5G filters. These are brilliant for cutting out interference from nearby mobile phone masts, which can play havoc with your TV signal. If you're in an urban area, seriously consider one with this feature. * **Power Supply:** Most internal boosters are mains powered. Masthead amps need a separate power supply unit (PSU) indoors that sends low voltage power up the aerial cable. ### Comparison Table: A Few Common Boosters (Prices are rough, check your local shops) | Feature | Labgear LDA202L (2-Way) | SLX 4-Way Aerial Booster (27806R) | Vision V20-100 (Masthead) | | :------------------ | :---------------------------- | :-------------------------------- | :------------------------------- | | **Type** | Distribution (Indoor) | Distribution (Indoor) | Masthead (Outdoor) | | **Gain per Port** | 8dB | 9.5dB | 10-14dB (adjustable) | | **Outputs** | 2 | 4 | 1 (to indoor PSU) | | **Noise Figure** | <3dB | <4dB | <2dB | | **LTE/4G/5G Filter**| Yes | Yes | Yes | | **Price (approx)** | £20 | £25 | £35 (plus PSU if not included) | | **Best for** | Small flats, single extension | Larger homes, multiple TVs | Fringe areas, long cable runs | | **Verdict** | Solid budget option | Good all-rounder | Excellent performance, tricky fit| ## Troubleshooting Your Signal: Before and After an Amp Honestly, I've spent a lifetime crawling through lofts and up ladders. Most signal problems come down to five things. Before you even *think* about an amp, check these: 1. **The Aerial Itself:** Is it old? Busted? Pointing the wrong way? If it's a relic from the analogue days, it might not be optimised for modern Freeview (which uses a narrower frequency band). 2. **The Cable:** Is it decent quality? Is it damaged, kinked, or frayed? Are the connectors solid? Water getting into the co-ax is one of the biggest killers of signal quality. 3. **The Connections:** Are all F-type connectors tight? Are the plugs pushed all the way in? A loose connection is a leaky connection for signal. 4. **Interference:** LED lights, mobile phone masts, even fridges can cause interference. Try turning off suspected culprits one by one. Filters help here, too. 5. **Splitters/Wall Plates:** Every time you split a signal or pass it through a wall plate, you lose a bit. Sometimes, removing unnecessary splits or old, passive wall plates can improve things more than an amp. Once you've installed an amplifier, don't just assume it's magic. Retune your TV. Check the signal strength and quality meter in your TV's settings menu (most modern TVs have one). You want to see *quality* as high as possible, not just strength. High strength with low quality still gives you pixelation. ## FAQ Section ### Q: Can an amplifier make my signal worse? A: Absolutely, yes. If your signal is already strong, or if it's full of noise and interference, an amplifier will simply boost that noise and potentially overdrive your TV's tuner. This can lead to worse pictures, more pixelation, or even no signal at all. Always check your aerial and cabling first! ### Q: Do I need a special amplifier for Freeview? A: Not really "special," but you need one that works with the UHF frequency range used by Freeview (470-790 MHz in the UK). Most modern TV amplifiers are designed for this. Some will also have built-in filters for 4G/5G mobile phone interference, which is a good thing to look out for. ### Q: Where's the best place to put a TV amplifier? A: For the absolute best results, a masthead amplifier should be fitted as close as possible to the aerial itself, typically on the mast. This boosts the signal before it travels down a long cable, preventing loss. If you're using an indoor distribution amplifier, place it where the aerial cable first enters your house, before it's split to multiple TVs. This ensures the best possible signal is fed to all your sets. ### Q: How much gain (dB) do I need from an amplifier? A: This is where people often go wrong. You want *just enough* gain to overcome your system losses (long cable runs, splitters). For masthead amps, 10-20dB is usually plenty. For indoor distribution amps, 8-15dB per output is common. Too much gain can be as bad as too little, causing signal overload and distortion. It's a balancing act, and a signal meter helps massively. ### Q: What's the difference between an amplifier and a signal booster? A: Honestly, the terms are often used interchangeably in shops, which causes no end of confusion. Technically, an amplifier just increases signal strength. A "booster" often refers to an indoor distribution amplifier that also has multiple outputs. But functionally, they both amplify. The key difference to remember is *where* you fit it: masthead (up by the aerial) vs. distribution (indoors). ## Final Word Look, getting a good TV signal isn't rocket science, but it does require a bit of thought. Don't fall into the trap of thinking an amplifier is always the first, or only, solution. More often than not, a good quality aerial, properly installed and pointed, with decent cabling, will solve 90% of your problems. If you've done all that, and you're still battling pixelation, then yes, an amplifier can be a saviour. Just pick the right type for your situation, don't go overboard on gain, and remember: if the signal going *into* the amp is rubbish, the signal coming *out* will just be louder rubbish. Get the foundations right, and the rest usually falls into place. Happy viewing, everyone!