I have a cb radio in my truck and lost the antenna offroading. I thought the antenna didnt work anyway (turns out I just didnt have a speaker connected to the radio). It was an antenna that went through the glass. If I were to get cheapo one from radio shack that goes through the glass would I need to have it tuned? Or are most antennas tuned in the first place

At that level of performance, I don't think you'll be able to tune an antenna very well. You won't be able to get close to a 1.0 standing wave so I'd skip the tuning part

I say put it on and run it. If your TX meter pegs when you key the mic, I'd look at maybe tuning it.

To tune it you need an swr meter.