We often pick up VORs at 200+ miles out. Yeah, that's at 40,000+ feet, but just to let you know that the signal is plenty strong enough to reach out there. At those distances we often see "interference" from other stations that are on the same freq, but maybe a couple hundred miles in another direction. I use the word "interference" loosely because I am usually just playing games with myself by guessing at stations down the line and tuning them in to see how close we are going to pass over head. For example we do lots of runs in the winter to and from Florida (to Michigan, Illinois, and Wisconson) and I get used to tuning in CTY, MCN, ATL, GQO, VXV, CVG, FWA, IIU.... as a way to pass the time, and I pull up a needle on the FMS. The question of the day might be: "Going from KVNC to KPWK, will we pass east or west of Chattanooga on our flight plan route? No looking at charts to answer - just off the top of your head."