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.