A mobile phone aerial on its own does very little for a modern phone, because smartphones have no socket to plug an external aerial into. What people usually mean by a mobile phone aerial booster is a kit with an outdoor aerial, a booster unit and an indoor aerial, and that combination does work well when there is some usable signal outside your home.

This guide clears up the confusion between stick-on aerials, external aerials and full booster kits, and helps you decide which one you actually need.

Do stick-on aerial boosters work?

Stick-on aerial patches, the thin stickers sold to go inside a phone case, do not make a measurable difference to signal. Your phone already has several well-designed internal aerials tuned to the bands it uses. A passive sticker cannot add gain or reach a distant mast. If you have tried one and noticed no change, that is the expected result.

The same applies to most passive window aerials that are not connected to anything. Without an amplifier and a way to get the signal to your phone, an aerial is only half a system.

When does an external aerial help on its own?

An external aerial helps on its own only when the device it is connected to has an aerial socket. Some 4G routers, mobile broadband hubs and vehicle kits have one or two SMA or TS9 connectors. Plugging a directional aerial into a router like that can improve your home broadband over 4G or 5G a great deal.

Mobile phones are different. Since phones stopped having aerial sockets, there is no direct way to connect an external aerial to a handset. To improve calls and data on your phone indoors, you need a booster that takes the signal from an outdoor aerial and re-broadcasts it inside.

How does a full aerial booster kit work?

A mobile signal booster kit has three parts that work together:

  • An outdoor aerial mounted on the roof, a wall bracket or a chimney, where the signal is strongest.
  • A booster unit indoors that amplifies the signal coming down the cable.
  • An indoor aerial that spreads the stronger signal around the rooms you use most.

The path works both ways, so your phone’s signal is also carried back to the mast. The result is calls that connect first time, fewer dropped calls and steadier 4G data, on every phone in the house that uses a network the kit covers. You can see how it fits together on our how it works page.

Which outdoor aerial should you choose?

There are two main types of outdoor aerial, and the right one depends on where your nearest mast is.

  • An omni-directional aerial picks up signal from all directions. It suits homes where there is a fair signal outside and masts in more than one direction, and it is easy to fit because you do not need to aim it. See the omni antenna.
  • A directional or Yagi aerial focuses on one direction and reaches further. It suits rural homes, farms and properties in a dip, where the signal outside is weak and the mast is some distance away. See the Yagi antenna.

Most of our kits include a suitable outdoor aerial, so you only need to buy a separate one if you are upgrading or adding a second building.

Do you need some signal outside first?

Yes. Any booster, however good its aerial, can only work with a signal that already exists. Walk around your property with your phone, including upstairs windows and the highest point you can safely reach. If you see one or two steady bars, or calls work in the garden but not inside, a booster kit can bring that signal indoors. If there is no signal anywhere outside, a booster will not help, and Wi-Fi calling is a better option.

Our guide to checking signal strength in field test mode shows how to read the real number in dBm instead of relying on the bars.

Where should the outdoor aerial go?

Mount the outdoor aerial as high as you safely can, usually on a chimney bracket, a gable wall or a pole on the roof, on the side of the house that faced the mast in your signal test. Keep it at least a few metres away from the indoor aerial, ideally with the roof or a wall between them, so the booster does not pick up its own signal.

Which booster kit suits a UK home?

Choose a kit that covers the bands your network uses and the floor area you need. A universal kit covers all four main networks, so it works for the whole household and keeps working if you switch provider. The Home Elite Universal Signal Booster suits most houses, and network-specific kits are listed on our pages for EE, Vodafone, O2 and Three.

Most kits are designed for DIY fitting; our installation guide covers aerial placement and cable routing. Delivery is free in 5 to 7 working days, and you can return a kit within 30 days.

Frequently asked questions

Can I plug an external aerial into my mobile phone?

No. Modern phones have no aerial socket. You need a booster kit that re-broadcasts the signal indoors.

Do mobile phone aerial stickers work?

No measurable improvement has been shown. Phones already have tuned internal aerials.

Is a Yagi aerial better than an omni aerial?

A Yagi reaches further in one direction, so it suits weak, distant signal. An omni suits homes with fair signal from several directions.

Will an aerial booster work with every network?

A universal kit covers all four main UK networks. Network-specific kits cover one.

Not sure whether you need a Yagi or omni aerial, or which kit fits your home? Send us your postcode and network and we will recommend one. How to choose the right booster