I realize this is a jeep question, but I know a lot of people use to have jeeps. My brother is getting a CB for his birthday and I was going to get him an antenna and stuff to go with it. If he is going to mount the antenna on a stock front bumper, is a 3' high antenna a good size? He's not around with his jeep for me to look at, but I think a 4' antenna might be too high. He'll mostly be using it just offroading. Thanks for any help.