Thanks for the tips and info.
The alien invasion part of the game seems to be going slowly, as the ETs are still sending mostly smaller vessels. I kept the CF-105 around in case it's involved in anything special later, but it's got cobwebs because I never send it out, so I'll start using it more against small UFOs. I was also currently upgrading my airbases to all Tormentor planes, so I'll put that down to lower priority for now.
I think I remember reading somewhere that Hyperwave Decoder works differently here than in the original game. I'm thinking in vanilla XCom you could get rid of all the other radars after building it, but in XCom Files one shouldn't do that. Is this correct? Freeing up some space in the bases would be nice if I don't need each radar in each one (small, large, hyperwave), but I don't want to lose tracking capacity if they're all needed.
That reminds me of another question I had which may be general rather than XCom Files related. All my bases have the same radars installed, but on the base info screen one base has Long Range Detection of 4, two bases have ratings of 3, and the rest only have ratings of 2. Why the different ratings?