Did some studying this morning and the jammers are not illegal to make or build but they are highly illegal to use, so you would get slammed by the FCC if you got caught. Not that it would matter in SHTF but for everyday use you would eventually get caught and would not receive any leniency. There is also the RF radiation. Anything animal or human that is too close to the antennae will get radiated. RF radiation attacks soft tissue first, eyes and male reproductive organs. At close range the RF cooks and prolonged exposure at a distance causes cancer. Lower power reduces the effects but also reduces range. Now you could possibly build an antenna that shoots the signal out in a beam instead of radiating in all directions but then you would have to have it aimed at the drone thus negating its use when you were not home.