@Michael, agreed, though these tests were pretty informal and were of little statistical repetition, most of it was likely due to different MCS rate negotiations for 2x2 rates. The main thing was to show valid performance at some distance with mobile devices. AP-275 testing has shown even better performance for mobile devices, with greater speeds at farther ranges. The takeaway for the OP is so long as they use an outdoor AP (the 275 would be ideal for performance, cost, and installation ease), 360ft should not be an issue for even their mobile devices.