S4C after switchover

There are a couple of intermediate chained relays that actually serve NO population, their sole purpose being to feed the signal down the chain to a more distant relay serving a population group.

Yes. Wenvoe does have one relay chain that's about 7 stations long. AIUI the DTT signals will require rebuffering and reclocking at each stage, to avoid the signal falling apart by the time it reaches the end transmitter. Because of that, I'm told the 7th transmitter will be running about 15-20 seconds behind Wenvoe !