How a TV Aerial Works
If you look at an aerial it consists of an arm with elements across it at different intervals . At one end it looks like its got wings.
What does it all mean?
If you look at the diagram below we will try to make some sense of it all.
The first part of the aerial to look at is the Dipole.
This fits between the last director and the reflector or wings as we call them. The Dipole is the main part of the aerial as it picks the TV signal up and sends it down the aerial cable to your Television. This is where you connect the aerial cable to.
Then you see the Directors, some times called the elements of the aerial. Their job is to direct the TV signal towards the Dipole of the aerial.
You will see adverts for 50 or 90 element aerials.
This means the more elements you have on an aerial the greater the gain as they direct more signal towards the dipole of the aerial.
The reflector or wings has two jobs. Firstly they stop the TV signals that the directors have collected going any further than the end of the aerial and they reflect the TV signal back to the Dipole.
They also stop unwanted TV signals coming in from the back end of the aerial. So when installing an aerial make sure the reflectors are at the back end of the aerial and the front end points towards the transmitter.