You can use the second fresnel zone to enhance the signal over a flat desert. 640 feet on either end is not that hard to do in Nevada.
Sometimes you can get tropospheric ducting or scatter in the 13cm band during the summer and autum when there are thermal inversions or when there is a stationary weather front. Paths in excess of 200 miles are possible. Tropospheric propagation has enabled DX reception of UHF TV (470-800 Mhz) signals up to 1,000 miles or more. The real skill is doing it within legal limits and with an unmodified card.
