I exercise about 40 minutes a day and I'll run one day and do circuit training the next day. I live in an area where there are brilliant hills and mountains so I get a good hill run with my dog. At home I'll do the circuit training with old weights along with pull-ups in the trees and that sort of stuff.
Intensity like signal strength will generally fall off with distance from the source although it also depends on the local conditions and the pathway from the source to the point.