From the discussion in this thread it seems likely that the source of the disruption is something that will be broadcast from ground level. Your position relative to that transmitter (bearing in mind the curvature of the earth) will likely matter far more than your elevation relative to the ocean.

If you are on the ground you will presumably be sheltered by intervening obstacles (building, hills, the earth) while a plane in the air (or anyone else significantly above ground level) may have line of sight to the source of whatever is going on.