Lance: Thanks for all of the hard work and great info!
I have a question on OTA pixelization that maybe you can shed some light on. I am a Dish subscriber with a 921 receiver and an Hitachi TV with an HD tuner. I installed a large roof top antenna - the deep fringe recommended antenna from Frigid (14 element IIRC). On channel 2 HD, the 921 pixelates every minute or so, but the TV is rock steady. KAKM HD is much more stable than 2.
I live 200' to the south of Klatt elementary school, which has a large metal roof directly between me and GB. The roof is about 15' higher than my antenna.
Also, channel 11 transmitter lies only 3 degrees off of the line between me and GB.
There is a radio transmitter about a mile away from me. Installing an FM trap helped, reducing the pixelization by about 1/2. I install a preamp, but that made the problem worse.
I am assuming that the problem is multipath, but don't know if the problem is the metal roof or channel 11.
Do you have any recommendations on improving the signal?