I have a Glomex. The advantage is, the amplifier is not built into the antenna, it's separate and has an additional input for cable TV. All I have to do is plug
the cable from the marina into the boat
, switch the amplifier over to "cable" and run a scan on the TV.
The disadvantage is, the amplifier is built into the antenna so in theory, there is a slight bit of signal loss before the amplifier. With a ten foot cable it's probably insignificant.
It's been in place six years or so without any lightning