I have a Whelen 295HFSA1 mounted in my truck, which works quite well. I guarantee it's much louder than anything thats included with a CB radio. It's capable of pushing up to 200Watts (Two 100Watt speakers). I have a single 100Watt speaker mounted to the frame behind the front grill. The radio rebroadcast feature is nice. I use it with my ham radio. Air horn works great, as do the other features. It definitely gets folks attention when necessary.