I've been running a Glomex Omnidirectioal Antenna on my mast for the past 6 years and it works great. The newer replacement is called the Shark. Not that I watch a lot of TV onboard, but have grabbed weather reports from Cape Cod to North Haven and an occassional fall football game here and there.
We use 2 Glomex's on the boat that I run. We got rid satellite when the antenna shit the bed and KVH said it wouldn't be supported for much longer because of our older antenna. We don't miss the $180/month fee.. The 2 glomex support our 7 onboard TV's.