Tonight I did a little test with my 4 watt radio modem to see what kind of range I could expect. Terrain and obstructions play a big part so, as in most things, "it depends" applies. To the West of my base about a quarter mile away is a highway overpass. This earth embankment seems to affect range in that direction. I was able to get reliable radio reception at about 1 mile. To the North and Northeast I was able to get about 9000 feet. To the southeast about 7000. This was done rather hurriedly but I think I can safely say that range in my conditions should generally be 1 to 1 and 3/4 miles. Note that this test was with the internal antenna on the LS. Using the external UHF antenna with the LS will improve range somewhat, but I don't know how much.