I've heard of other folks doing that. How far are you from the broadcast antennas and do you get many channels?.
17 NM from Milwaukee broadcast towers to the Port Washington marina and we get all the city's broadcast stations. Also get most of those same stations when down in Racine, 22 nm away.
We have a TERK indoor digital antenna too but haven't had the need to use it lately (but we have it).
We have noticed an increasing number of marinas have cable TV available right at the dock pedestal. I wired a coax connector high inside the chain locker and ran the feed to a location near the TV. We carry a 25' length of coax to connect the dock pedestal to the boat.