Re: For those of us less technical.....
Opt for an LCD TV (not plasma!) with a DVB-T2 receiver and native 1920x1080 resolution, then you can receive High Definition - assuming your local transmitter is supporting it?!
There are a couple of ways you can experience interference, other than the usual blocking and pausing (my aerial is a mere 2.5km from Sandy Heath, which transmits 220kW, yet my TV and DVR still experience drop-outs!). If a 4G operator enables a tower (or builds a tower) that your aerial can see, the powerful signal (I say powerful - it's all relative to the power of your local TV transmitter(s)) may blind your receiver to the TV transmitter. Yagi aerials (used for TV) typically have a +/- 15 degree acceptance angle, so even if it is pointed dead-on to the TV transmitter, a nearby tower within the 'acceptance angle' could still cause a problem. Think of trying to look at a torch in the distance whilst some yob shines a laser in your eyes.
The other problem could come from a nearby 4G tower in your local area. As we are talking about milli-metric wavelengths (a quarter-wave at 800MHz is ~93mm), there is always the possibility of pick-up on the co-axial cable, or the aerial itself; even if it's pointing in the other direction.
Both of the problems above can be exacerbated by a wide-band aerial (possibly fitted to cover both analogue and digital transmissions) and/or an amplifier-splitter. Aerial amplifiers are often wide-band, covering Band II VHF (87.5 - 108.5MHz), Band III DAB (220 - 240MHz), and both Band IV and Band V TV (400 - 800MHz). A strong 4G signal could overload the amplifier and cause it to parasitically oscillate (poorly designed models can do that all of their own accord!). Result: no signal!
We have no real way of knowing if the 4G roll-out will affect few, or many. As Ofcom have no technical expertise, and have farmed out domestic radio and TV interference problems to the BBC, I am sure people are going to be left scratching their heads staring at a black mirror.
I hope you found this reasoned guidance?
CBer and non-bearded Radio Amateur.