200 miles using 2m SSB from a mobile setup is actually not unusual at all. Although I don't work 2m SSB mobile much, I do work 2m SSB from home and about half my contacts are with mobiles using such loops, and they are often 100-150-200 miles away.
Pat N6RMJ uses a pair of stacked loops (I think he still does) on his SUV on 2m SSB and it seems that everywhere he goes, I hear him -- including places that are hundreds of miles away.
Remember, SSB as a mode has about a 20 dB advantage over FM as a mode when it comes to working weak signals. Then, horizontal polarization for VHF tropo work has another several dB advantage over vertical polarization, just because horizontally polarized signals scatter over the horizon better than vertically polarized ones. Then, most home stations on 2m SSB are using horizontally polarized beams with substantial gain: 12-13-14-15 dB gain systems are quite common...so you've got that advantage, too.
My rule of thumb in working FM/mobile on 2m vs. SSB/mobile has always been: If I could work distance X on FM, I could work distance 4X on SSB, just because of those advantages. So, making a 200 mile contact on SSB is about the same as making a 50 mile contact on FM.
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