Wondering about possible radio interference sources. For example, we have a Raytheon plant in our town and they have several towers with radar and other instruments. I'm assuming those are a place to stay away from but not sure how far away to stay. For example about 1/4 to 1/2 mile away from a very nice school park that would be great for flying. To risky?? Cell towers, I assume just don't get too close. Some water towers have cell equipment on them too. So just not sure here. Thoughts??