If you get a Gap Challenger, it will do 2 meters, 6, 10, 12, 15, 20, 40 and part of 80 meters with no antenna tuner needed. It will be under 2 to 1 at band edges and much less in the middle. This antenna does not need a tuner to radiate signals at low SWR and is not any kind of dummy load as some are.
I have one and they are great DX antennas. 10 and 15 meters can be a little weak (Not all that bad, just not as strong as the other bands, look at all the contacts I have on 10 and 15 meters on QRZ.com, type in KF7VXA), but when those bands are open, it will make contacts all over the world. The other bands are fantastic on this antenna. I just started logging my contacts not too many months ago and don't log them all by any means, mostly just new or special station one's. It's a vertical dipole so it does not need 40+ radials. It has 3 radials, but they are an unsidedown top hat for 40 meters.
Go to EHam.com and look at the reviews on the Gap Challenger. There are about 5 pages of very happy people who have and use them. The only people who put them down are those who have never used one, they rock ! Look up my page on QRZ.com and see all the places I've made good contacts. These antennas work great with 100 watts or with an amp. They are not a yagi at 70 feet, but for a multi band Omni vertical are great.
I talked with New Zealand (one of the harder countries to get, especially from my lousy QTH) tonight and the guy said I was the loudest, best sounding station on the west end of the US. I was using 500 watts and with a 10 over 9 signal, could have worked him with 100 watts, others were using 1000 to 1500. The antenna is a great value at $350.00. It's almost a plug and play. No coils or traps to go bad or eat signal strength and easy to assemble and put up, nothing to adjust on the antenna like the others, so no putting it up and taking it down a bunch of times to adjust SWR. I break most DX pile up's in less than 5 calls, but not all. Most last for 20 years with nothing going wrong with them. Other bottom fed verticals can't say that. Some are darn good, but none better overall than the Gap and the Gap put out almost 100% of the signal it receives, others don't.
I get compliments on my signals all of the time on 100 or 500 watts and consistent high signal reports.
It will not radiate UHF, but does 2 meters like most 1/4 or 5/8 wave 2 meter antennas, decent signal. Height is not all that great for 2 meters, that's the only limitation, but you will make plenty of simplex and repeater contacts with it.
73's John KF7VXA