The Reason Why TV Aerials Are Installed On Roofs

Jul 9, 2019

If you have ever wondered why TV aerials Manchester typically install television antennas on chimney stacks, roofs, or high up on a wall, usually best for large aerial masts. Read further about everything thrilling detail you should know about TV aerials.

Radio and TV aerials will both receive a signal from a land-based transmitter, which is different from the satellite dishes that receive signals from a satellite out in space. This also means that nearby buildings and trees can interfere with the signal between the transmitter and your property which can block most of the signals from reaching your home unless your property is located close by to the actual transmitter. If this is the case you might be able to use a loft aerial or one of the indoor aerials. Yet in most cases, it is better to or necessary to have the aerial installed on the outside of the property.

Installing An Aerial As High Up As Possible Will Maximise The Signal Strength

If you have your aerial installed outside, you will probably increase the signals received by your TV aerial which provides a reception that is more reliable and it will be less susceptible to pixelating and breakups. When installing an aerial on a roof of a home they are likely to clear any close by obstructions such as other building or trees and less of the signals will become blocked from actually reaching the TV aerial.

If you are able to achieve a line-of-sight between the TV transmitter and TV aerial, you will probably receive a good radio or TV signal. In addition, the alignment of the aerial is also likely easier as it is simple to position the aerial using your eyes without the need for specialist alignment tools for aerials.

Even though it is suggested to install antennas on the outside of a building, care should be taken in order to avoid overloading the distribution equipment and TV tuners with an excess amount of signal, especially if you reside in an area that already receives strong signals. You can usually resolve this issue using an attenuator yet you may want to choose something such as log-periodic aerial over a high-gain aerial to assist with avoiding this problem.

In the way of installing an aerial as high up as possible on the outside of your home, you will maximise the signal strength. At the same time, you probably won’t require a TV aerial amplifier in order to operate multiple TV points. In most cases, a passive-splitter will work just fine. This has to do with the fact that you can lose some of the signal using a splitter as the TV aerial will already be positioned in an area whereby the signal will be at its strongest.

Each Additional dB Of Signal Received Will Result In A More Robust And Reliable Signal

If you know the right way to measure TV aerial, terrestrial and satellite radio signals you may understand what we are talking about. If you have no idea what this means, the signal strength of TV aerials is typically measured in dB which is referenced with micro-volts. The bare minimum for the digital TV signals similar to what is utilised for Freeview is 40dB, yet you should be looking for measurements of 45dB and higher.

When receiving under this measurement you will need to install your aerial at the highest point possible where these signals will be at their strongest, you may need to consider a bigger aerial pole. You should also consider installing a masthead amplifier or higher-gain aerial to give your signal the boost it needs to overcome signal losses linked to connecting-coaxial cables.

The signal strength is only one of the measurements that you need to think about. The next includes carrier-to-noise or signal-to-noise. This is the relationship between unwanted noise and actual received signals in your signal. For example, you could be receiving 60dB of signal from the antenna, yet have interfering signals of 40dB using the exact same frequency. This ultimately means you are only receiving a 20dB of signal strength which is very poor. This is known as the carrier-to-noise ratio. Each piece of equipment will have its own way of measuring this. However, I suggest if the equipment you are using is required to take note of MER (Modulation Error Ratio), this allows you to assess the signal and provides a measurement that is more reliable. I will go into this information in further detail in my next blog post. In theory, each extra dB received from TV aerial will usually add directly to the actual carrier-to-noise ratio which will result in a more robust and reliable signal.

TV Aerials Manchester, 22 Lever Street, Manchester. M1 1EA Tel: 0161 883 1945