Yep 1.2 and 2.4 are a no go ...LOL That is why I use 433MHz with my 1.2 system. 900Mhz works great with 2.4 radios, and will fly behind obstacles with in reason.
I use both 5.8Ghz and 1.2Mhz.. 5.8 ends up being my aerial and line of sight stuff.
the 1.2 for longer range and all around flying. The 900Mhz in a 200mw has as much range as a 500mw 5.8Ghz. also the lower the mw VTX the better your radio signal will be .
It don't have to fight over a high powered video transmitter to keep connected.
I have flown a 5.8 600mw video transmitter and it killed my radio link when I got out pretty far.
I had great video but lost control of my multirotor. I swapped to a lower power 5.8 VTX and got good range but didn't lose my radio control near the same distance.
So the high power will be screaming video all over the top of the 2.4 radio. Just a thought when choosing a setup. Plus think of this... a lower powered system will be better for this reason.
I would much rather start to loose my video signal before I loose control/
I can turn around if the video gets weak, but you don't have that option if the radio signal gets weak.