You got options on tuner for OTA stations and unencrypted cable.
I am using SiliconDust HDHomerun which has 2 tuners in it (can be used for both OTA or unencrypted cable) and if you have windows 7 can set it up to record channels or watch them LIVE. Very nice in high def. But you need to have PC on to watch anything. But you don't have to add a card to your computer. The homerun plugs into your network and will be seen on any PC on your network (wifi or wired). Depending on your computer, vga or hdmi. My computers have hdmi out so I get sound and video when I connect to my projector and have option of speaker system in PC or projector speaker.
Here is link to Amazon , this is a newer model than mine, I had the white version . http://www.amazon.com/SiliconDust-HD...8655397&sr=1-1
There is even a newer version for OTA and full blown cable but it's 199 and it doesn't sound like you got cable, so forget about it.
If you don't care about high def use those government coupon digital tuners, the ones from a few years ago, I got dish network ones which are cool , they were rated as very good when everybody made the switch to digital. These should be super CHEAP, ask someone that moved to HDTV's if they have any those digital tuners laying around the house when everybody made the switch to Digital Channels a few years ago. I bet they do and they are not using them. Maybe get it FREE too.
Doesn't sound like you watch much TV so maybe first try the digital boxes that came out a few years ago, it has menu and you can see what is gonna be on for I think 14 days. No PC hookup and you get the listing OTA. Of course it will use the RCA inputs (yellow,red,white). Every projector should have composite I would think.
If you are interested in recording anything then move up to high def for sports and CSI and other shows with the Homerun. Watched the Superbowl using the homerun, very nice.
p.s. I just tried out my dish digital to analog converter box (DTVpal) and it looks really good, I get about 47 stations and the built in over the air TV guide is very nice, gives signal strength, and as grid type station menu and it can auto switch stations to next program you want to watch. It is 480i but it's clear and bright and very watchable.