When I purchased my boat I was given a connector that you could hook to a battery in an emergency to operate the hatch. The connection was under the dash. My boat is a 370 Sundancer, so I do not know if this applies to you.
I have the same boat. Inside the stereo compartment, first overhead cabinet in the cabin on the starboard side, there is an antenna signal booster. This must be powered up, and turned up for signal strength. That is if you are looking for broadcast ...
