It is apples and oranges indeed; the R20 is a wideband handheld, the other 2 radios aren't. The R20 wil most likely be just OK when the signals are strong, but if a good band opening happens, or it's crowded on the band you're listening, my bet is you're going to get a lot of overloading if you put a long antenna on it. Best to stick with no more than 15-20 foot (less if you're on the East Coast, where sigs tend to be a bit stronger - ditto Europe) of wire as an antenna - if that. There was a review of the R20 on MT somewhere....
You really would be better off with one of the mid portables, such as a Sony 7600G or one of the Kaito/Degen models. Our SWL and Utility wiki pages have links to all sorts of reviews. I'd highly suggest using them to do your research. 73s Mike
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