Freeview...?
Answers: You enjoy lost the commercial stations. Does this mean that they're shy and are embarrased by the surfeit of corny motor insurance advertisments that they have to show.
Now the "techy" bit.
Freeview (digital) box stations are grouped into "Multiplexes". You can up to 6 stations in respectively multiplex.
Analogue television sent one box station per UHF channel. Digital tube sends 1 mulitplex per UHF channel. That's why you can seize so many stations on digital.
If you have poor reception in "the frail days" you would notice ghosting or curvilinear lines and a bad picture on some channel (tv stations).
Unfortunately, digital television doesn't abase so elegantly and when the signal from the mast becomes discouraging you can lose a whole multiplex. That's why you enjoy lost a group of channels. I expect the remaining ones sometimes turn blocky or sparkly too.
Changes in the weather, wet through, even building work between your aerial and the transmitter can rationale the reception to fall past its sell-by date from a previously good rank. If your aerial is "individual just worthy enough" then you'll discern this quite suddenly.
The solely solution is a decent satellite dish. Don't bother with booster amplifiers, they amplify reverberation and rubbish as well as the broadcast.
A professionally installed big gain aeral will cost about lb120 or so. That's not much compared beside your home entertainment system and will remove your reception problems for ever.
Sorry it's not a funny answer. When you've sorted out your telly in time to keep under surveillance the next series of Torchwood you can enjoy a jolly well brought-up belly laugh.
PS. Man walk into a bar .... "ouch!"
Bad weather can effect the signal so that could be what's cause it..?
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