RF distribution

When building TV facilities there is often the requirement to include an RF ring main of some sort so that office dwellers can see off-air channels and even channels modulated on in the building - it's good to know that channel 6 (for example) on every TV or VHS in the building is seeing the output of the studio (for example).
Having trained at the beeb I'm very familiar with the old method of having a launch-amplifier that sends RF on a passive distribution, typically sending initially at 100dBuV and using attenuators whenever a TV or VHS is connected to the "ring". This system is robust and once implemented is cheap to scale - all you need at each TV is a passive attenuator. The only design consideration is that you keep track of the attenuation introduced by the co-ax and use local attenuators to feed the TVs.
The only down-side to this method is that in the last twenty years everyone has a domestic VHS on their desk as well as a TV and even the best designed modulator input stages leak signal back out of their inputs - you'll see a tiny amount of the tape output of a VHS on it's RF input - not a problem at home because that tiny signal (typ. less than a dBuV) stops at the antenna. In an RF ring main it all accumulates and the overall ring gets a bit noisier. Go to any aging BBC facility and the engineers will tell you how noisy the RF is and it's not down to the quality of the components - it's all those VHS machines (and now PC TV cards, PlayStations etc.) leaking a tiny bit of signal back up their inputs.
And now I will show you a better way!
Hotels tend to use multi-output RF DAs that have individually isolated outputs - it by-passes this problem. The issue is that now you have to run RF cable to every desk or room but you can abuse the system a lot more with no impact on the quality of the RF. Since we've moved away from 10Base2 to 10/100/1000BaseT (or even fibre) networking we're used to running cables per person rather than big rings you tap off I don't see that (at install time anyway) it is such an issue.
Suffice to say I use the latter (at our current MTV install as well as every other facility I've built).