monty77
If you can not get MuxD you have an aerial signal problem.
The signal meter is very inacurate on any freeview box and should not be trusted, the quality meter is better but will only drop when things are very bad = if it drops from what every one else has, you have real trouble.
The Humax twin tuner (PVR9200T) was your best bet for working on a poor aerial signal = its tuners work on a lower signal acording to the technical specs.
The Humax does have a fault with not waking up to record radio from standby, but TV is ok except for the odd program on ITV4 and when a station is on for only a few hours a day and you ask it to record the first program of the day. I have had the humax twin tuner since it launched.
One easy way to improve your aerial signal is if you have thin aerial lead inside the house, replace it with thick stuff like what comes from the aerial and on the outside of the house and satalite dish. Even if you only have a couple of meters of thin stuff, it reduces the signal alot. The cable you need has copper foil in it = not alloy or nothing, its often called digital or digital satalite or low loss. The plugs should also be the all metal sort on the outside = not plastic. Make sure the braid is pulled over the outside of the plug clamp and no stray pieces of braid touch the centre core.