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The problem is the frequencies for channels 7-13 line up roughly with the frequencies for FM multiplied by 2 (the first harmonic). Very strong FM signals can set up interference at that first harmonic, wreaking havoc with reception of the TV station at that frequency.
BTW, to see the terrain profile used by TVFool's model, click on any station in the list. A separate window will pop up, showing the transmitter at the far left and your location at the far right. You will see how you are shadowed from stations to the north.
Last edited by Dave Loudin; 8-Jan-2011 at 3:36 PM.
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