Coax cable for long run up mast

[Algallop]

I'm currently painting the wooden mast on my 1959 Stonington Motorsailer, and I thought it would be a good time to run my antenna up the main (it's on the mizzen right now).

The run from the deck to the top of the mast is about 35 feet, so I'm thinking a 50-foot cable will get to the cockpit where I'd like to re-locate my VHF (currently in the aft cabin, making it a pain in the ass to use when single-handing).

As I read about cable types, connections, etc. I feel like I need a degree in electrical engineering to make a good decision on hardware. Can anyone give me a recommendation or link to an affordable, durable 50-foot antenna cable that will function well with minimal power loss? Any advice from someone smarter than myself would be greatly appreciated!

The radio is a typical 25-watt fixed mount.