I live in an HOA community where antennas are frowned upon. My neighbor has one of these up on his roof (see picture) and I'm wondering what exactly this is. I'd ask him myself but I almost never see him out of the house. I do NOT want to get him in trouble and I'm assuming it's some kind of FCC-protected TV antenna. But if it's something that could be useful anywhere in the ham-radio sphere I'd vey much like to learn more about it.