Fly near airport question....
Our local field is that distance from an active runway and there are no radio problems either way and have flown on the primary runway for public airshows. However don,t even think about it without prior arrangements with the local control tower chief and a written authorization. There usually will be an altitude limitation. At one point some years ago our site was on an unused taxi way. The current site is still on airport property at 1.5 miles.
John