If you're in a newer area with underground power lines, and if the CC&Rs don't specifically address balloons, I'd take up the hobby of Open-House-TYPE balloon flying, you know, like kite flying. Who's to say what the string is made from, or whether or not it's metallic.

Some of those open house balloons fly above 100' out here, but you'd play hell trying to get a stable signal on a windy day.