Yes, the booster needs power
Excellent reception for 50 + miles.
Installation instructions are VERY clear and it is a very simple hook up.
I have 3 TV's and have no issues for more than 9 month.
the better the height the better the reception - over the water every foot makes a difference - Be sure to use a good waterproofing on the connector not just a boot, but good tape wrapping - all the other components are OK for saltwater exposure as its all plastic etc, suggest replacing the mounting screws with brass though,
50 + miles