Yeah I have dozens of SMA attenuators in a box but it worked out cheaper to get a variable power amp than buy SMA<->push-fit co-ax adaptors.
It still required adjustment every time they shuffled frequencies/multiplexes around so what works this week might not next week. That's the problem with having lower power reception - you start with rubbish & amplifying rubbish is problematical.
If you don't have lots of DVB-T stuff (unfortunately most of us do) I think I'd just advise people to use DVB-S. You can get a dish with 8 LNBs & that's enough for four rooms without any sort of distribution equipment as long as each cable is < 20m. We've never had any issues with rain/snow causing picture problems but our cables are a lot shorter than 20m.
DVB-T in the UK is only going to get worse as the available frequency band gets squeezed by mobile/data services. Combine this with more 256QAM (HDTV) channels & unless you have great reception its going to cause progressively more problems.
I'm not sure I'd bother with "FM" - its entirely possible "FM" will be toast inside a very few years. The fastest variants of g.fast will require that frequency band to be freed up* in order to prevent interference - various UK govts have been trying to get rid of it for years anyway.
Anyway I'm no real help to the discussion as I failed at this years ago
*people will still utilise that band but permitted power levels will drop to tiny fractions of that used now.
