I think they work okay on 10m, on channel 1 on the cb band is where my swr is at its best and that is with the whip all the way down and no trimming. I get a 1.1 swr or around that on 1 and about 1.2 or so on channel 40. I have heard of others using them for 10 meters. And yes it's tall, taller than a wilson 5000 or a k40 and it's does great on am and ssb as well and dx'ing doesn't seem to be a problem either. The most power I have out through mine is around 300-350 watts. It's a good antenna, much better than the wilson 5000 or the k40 IMO. I have had the others and the sirio has out done them both on tx and rx. Hope this helps and god bless.