teleview

As always , metal backed insulation makes a great signal reflector / bouncer , also known as Multi Path .

Digital Tv tuners can deal with some Multi Path , however if there is to much multi path the digital Tv tuner will Not be able to deal with it , and the signal strength --> Reading <--will go up and down because the tuner is adjusting the signal --> Trying <-- to get a stable lock on the Multipul signal reflections.

And Yes this situation often happens when the reception is VERY STRONG.

And Yes this can happen to only 1 channel or more then one channel at at a time.

The best way to deal with signal reflections is to move the antenna Away from signal reflections and get a more directional antenna.

The more directional a antenna is the more the directional antenna rejects signals from other directions , like reflections up on reflections signals bouncing around all directions.