Real channel 43 is a good example. The top end of the channel is 650 MHz.
http://en.wikipedia.org/wiki/Televis...he_Philippines. At this frequency, RG6 has 5.2 dB loss per 100 feet.
The AP8275 is rated at 28 dB gain in the UHF band. So the math is 28dB / (5.2 dB / 100') = 538'. The question would then be, "Will the power supply be able to power the preamp through the resistance of 500' of RG6?" To answer that, Winegard says that the AP8275 draws up to 100 mA.
http://www.winegard.com/kbase/kb_tip...hp?tip_num=389 Use a good quality RG6 cable with quad shield and solid copper center conductor (Belden 7916A for example, available through many sources including
http://www.solidsignal.com/pview.asp...16A-0101000%29) and you can expect the total resistance of 500' to be about 5.6Ω which means that there will be less than 0.6 volts of voltage drop... so the AP8275 should do fine.