Comment: Try to read the registration number the next time it flies over

(See in situ)

In reply to comment: We had a garden built. Cost (see in situ)

Try to read the registration number the next time it flies over

And run the number through the FAA registry.

http://registry.faa.gov/aircraftinquiry/NNum_Inquiry.aspx

That should at least tell you whether it's something innocuous like a news station or hospital owned chopper, or whether someone could actually be keeping track of what's in your garden. Wouldn't be surprised if having one professionally installed got your information fed through a fusion center and the DEA wants to make sure you're not growing freedom weeds.