Yes you can... but the only people you'll find on there are "radioheads".
CB range isn't a set-in-stone 20 miles. It depends. The antenna, and where it is, is everything. In general, bigger is better, and up higher is better. It also depends on the "skip" level. During the day, signals bounce off the atmosphere and come back down, causing tons of background noise and static. It peaks in 11 year cycles, I've been out of it so long I don't know if we're in a high skip time or not.
It quiets down at night. A long time ago when I was a radiohead, I had a huge antenna and big (illegal) power amplifier and used to collect post cards from people I contacted hundreds or thousands of miles away.
Real-life car-mounted CB range is usually a few miles at best, unless things are quiet, you have a big antenna, and you're in an area that's wide open. BRC is perfect, totally flat and open and only a few miles across, and a little convoy of cars (there I said it) is perfect for CB too. In the old days you needed a license but they did away with that years ago.
Too much is not enough, and when in doubt double it.