Spectators are welcome at the Shootout. No admission fee, either. You'll be required to pay attention to Land's End Lynda about how to know when there's a vehicle about to run - so you'll park it in a very safe off-track area. No moving around of any kind during a run. If you do you'll likely find Jr. or one of the course stewards moving towards you at a high rate of speed, and once he gets there I promise you'll be asked to stand still - or maybe to leave the salt.
There's no CB radio there, and broadcasting on an FM radio (for your car) probably won't be there, either. If you've got a police scanner you're welcome to listen in. Some of the teams use "high band" FM - in the 150-170 MHz or so range, and some of the stuff is on the "UHF" band -- 450 - 470 MHZ. I'd concentrate on the high band if I were buying a scanner.
Once you're on the salt you'd have a great time watching from the spectator parking area around mid-track. But please do think about driving down to the freeway end of the course and taking a look around the pits. Because it's such a small event you'll have plenty of room and time to see all of the stuff that's going on.