The KG-UV# is one of the BEST "SAT Friendly" radios, in that you can program the memories to cross band
, my mem's are:
22 SO50T 436.805 145.850 OFF 74.4 HIGH ON WIDE OFF
23 SO50AA 436.805 145.850 OFF 67 HIGH ON WIDE OFF
24 SO50A 436.800 145.850 OFF 67 HIGH ON WIDE OFF
25 SO50 436.795 145.850 OFF 67 HIGH ON WIDE OFF
26 SO50L 436.790 145.855 OFF 67 HIGH ON WIDE OFF
27 SO50LL 436.785 145.855 OFF 67 HIGH ON WIDE OFF
For SO-50 OPs you really do not need the 2m 261 unless you need to listen to 'yourself' doing the 2m uplink??? Now listening to yourself, aka full duplex of the 436 downlink would be handy to confirm your confirming your SO-50 access. Remember make each TX ----short---- very short, pass max ~15min, CQ is just 'call-sign + grid'. Think contest pile up for quick info exchanges too!
As far as antennas - I use an ARROW, but you can build one and there are plenty of simple DIY plans at my YGroup and others (use RG-8x type but never RG-178/ 0.125" size coax, way to lossy even in short runs!). When I do SAT OPs I also use a headset w/boom mic, and a DVR to record the pass for later logging - remember you only have so many hands! That is why I modified a 4' wood ladder for my poor-mans SAT portable mount. You can find info/pics at my HAM-SATs YGroup - see link below. Next year FOX-1 will start its ~12yr life flight. However, be it known FOX-# have flipped the uplink/dwnlink convention.
Uplink likely will be 432.150 and downlink 145.950, so your 261 will come in hand for full duplexing.