In article ,
Colin M wrote:

Don't automatically assume bigger is better. If you are close to
the transmitter and install a high gain antenna, you can overload
the front end of your receiving equipment (not causing damage,
but enough signal to introduce picture quality problems).

Other way round I think. Close to a transmitter (as we are)
there are big problems with bounces and ghosting. So most
people reduce the ghosts with a directional aerial, (which
also tends to mean high gain), and then inline attenuators
to reduce the signal.

--
Tony Williams. Change "nospam" to "ledelec" to email.