how do i get tv cable out to barn?

digging a trench tomorrow for electric and gas.

what do I Put in there for cable tv service?

I am guessing it needs to be fairly robust for direct burial and would need some kind of amplifier. It will be running about 450 feet underground.

RG6 coax is what you need. It needs to be direct burial, or put inside conduit. I'm not sure about the need for an amplifier, 450ft is a long way. BTW, you might as well run a cat5 out there while your pulling a wire (if its in budget). Just in case you ever need internet or phone out there. I always recommend running a spare coax as well, just in case something ever happens to line #1

Originally Posted by sledge

+1 on Jax advice. Wouldn't change a word of it!
Nice!

I use to do work like that for years, and its no fun! If your going to use a conduit it, do yourself a favor and go bigger than you think you will need. For a far location like that we normally would run 2 coax 2 cat5. Get you a bucket of pull string, tie a piece of plastic bag onto it like a parachute, have someone on other end put a shop vac over the pipe, and it will suck that pull string right through the pipe.