I own one of these... in the 90's they were all the rage for cb base stations... (nowadays there is a better model) The tuning rings is what I would use...
On field day I mounted one to the back of my truck and worked 10m local (down to seattle from my 2200' alt.) and dx with it.
Also used an autotuner and got it tuned on 20m although 20m was a mess on field day.
The tuning rings usually will give you 12-10m. If not, the match will not be high probably. I have heard of a few people using these on 10m FM up at the top.
If you can't get the swr down to 1:2.0 or less with the ring then use a tuner but i've never seen that happen...
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