Well when it's all said and done, make sure you tune to the proper HD channel.
You'd be surprised how many sports bars I've been in with fancy plasma HDTV's, yet the HD set top box below them is showing the SD channel number.
If your going with Cable, remember that HD channels are on different numbers. If your going with DirecTV, you can go into the guide and select "Hide SD Duplicates". All HD channels are on the same number with DirecTV.
For example, ESPN HD is Channel 202 here. BUT countless times I'll see Channel 45 (ESPN SD) on the front of the SD Box, and a washed out picture on a nice flat screen TV. I mean, why do some of these bars pay for all of this expensive equipment, not only that but the HD Cable service, but yet they don't use it?
So educate your bartenders! Either that, or get DirecTV, and then you can even get those sports packages like NFL Sunday Ticket. DirecTV is the way to go in a Bar. They have the most HD channels, it's easier to use. Cable is more for a home setting where you would want to use Video on Demand, and bundle pricing deals with High Speed Internet and home phone service.
Here at our job, we use RG-59 liberty cable with RCA ends terminated. We have a DirecTV HD system and the picture quality is amazing.