I used an IC-7100 on 2m FT8 while mobile, as a rover in the VHF contest this past weekend. My HO loop for 2m had not yet arrived for mobile ops, so I was stuck using it on a 2m 5/8s whip... vertically polarized and on a mag mount. The few times I could park I ran 2m SSB and FT8 on my Arrow antenna. But 80%+ were mobile on the whip. And yet it worked. And worked rather well. I was not only cross-polarized, running mobile, on a mag mount, and maybe 20w into a lousy match. The bands weren't crowded, but I worked several grids over... and given the geography here that is kind of amazing. Same was true on 2m. Then I tried it on 6m out of desparation (screwdriver tuner wasn't matching). Voila. Worked a lot of 6m FT8 on the same whip. And 6m FM. But SWR on 50.125 was sky high, so np luck there. 432 here is usually much quieter. I worked several stations on FT8 though more on SSB. In previous contests before FT8 came around I usually worked JT9 to a couple of folks. I didn't try 222 FT8 but ran 223FM since more people had that. Next contest I intend to. I don't know of anyone within 150 miles active on 902, especially digital 900. 1296 I haven't heard about digital at all, most is FM and SSB. The local boards here had posts recommending FT4 instead of FT8 due to excessive drift in the IC-9700 during the longer transmit cycle. There are several meteorscatter folks in the region but mostly on 6m. So thats also a possibility for 2m on up, but there are fewer ops by far (here) compared to other modes.