Originally Posted by Bubba91
well sorry forgot to mention i do have a pre amp Winegard AP8700 Chromstar 2000 Series VHF/UHF Pre Amplifier (AP-8700), but KCAU was good tonight, but not good was KTIV really pixelating, kpth had pixelating, KMEG was skipping a bit, but somewhat watchable as was KSIN.
What is edge 1 and edge 2? sorry i am fairly new to this digital tv stuff.
By the way i have google earth how do you find the hills like you were saying BVFAN?
I'm sure someone with a better grasps of wavelengths, diffraction etc than I will correct me and explain this better than I can so.. my understanding is that when the tvfool plot shows 1 edge or 2 edge diffraction that means that you do not have LOS (line of sight) to the transmitter and the way the signal reaches you is by bending (diffracting) through the atmosphere.
The tvfool site has transmitter plots you can download and then import into Google Earth. Go to coverage maps on the site and find Sioux City. So you could download both SC and DesMoines to see terrain and how it affects your signal. Google Earth also gives you ground level altitude readouts. I just went on a straight line from Carroll to SC to see than Carroll is at 1,250 ft and there are hills at about 1,450 ft just NW towards SC.
i have attached a 3D plot of KCAU from Carroll looking straight at the SC transmitters. The purple color means you are at the edge of reception. It is better to be in the cyan range. The green is just the earth and no reception.
This is the same plot I attached before only looking at it from closer to Earth and rotating the horizion.