OK. I'm the exception to what a lot of other folks have to say about the CHA 250. I have used one on my motor home for the last couple of years and it has worked very good. IT IS NOT A YAGI. IT IS NOT A VERTICAL WITH 30 GROUND RADIALS. As soon as folks stop expecting it to be something it's not and actually use one, they find it does what it's supposed to do. It does work well without a tuner. It is super simple to put up and take down. Less than 5 minutes each way. I have a Tarheel 200 also mounted on my rig and the Comet has better ears. The Tarheel is mounted to the rear ladder with the whip above the roof line. The Comet is attached to a telescoping pole that is 16 feet long, extended, and attached to the rear ladder. I have a Gap Titan at my stick house that I would gladly trade for a Comet CHA250B. I'm not an engineer but I've been involved with Ham Radio since 1961, off and on, and I know what I expect from my equipment.
Just my dos centavos worth.
Doc