I'm puzzled by the "snowy" comment - snow is just noise on the signal. I don't have digital but I thought it either worked or didn't - ie you can't get a degraded picture (except complete breakups).
I guess you were referring to the analogue picture. I think that needs to be pretty much perfect or digital is a no-go.
It's always best to replace the coax - water gets in it and makes it lossy. Cheap coax is usually pretty crud but in good signal areas is often good enough - to guess the quality look at the braid - if you can see the core insulator through it it's cheap (regardless of what it cost). Top notch cables are usually semi-airspaced (not a foam insulator but polythene - either extruded with triagular air spaces or with a big gap and a spiral of polythene running up inside.
The other thing is the aerial - again I don't know but I imagine it has to be very broadband given the number of channels on digital. Normal TV aerials come in groups A B C and C/D depending on which transmitter you are receiving - I'd imagine an aerial for digital may have to cover the whole UHF TV band which from my experience means a log periodic design would be best (you could use google to see what that is).
Sorry - after typing all this tosh I realise it's probably of limited use to you.
I guess you were referring to the analogue picture. I think that needs to be pretty much perfect or digital is a no-go.
It's always best to replace the coax - water gets in it and makes it lossy. Cheap coax is usually pretty crud but in good signal areas is often good enough - to guess the quality look at the braid - if you can see the core insulator through it it's cheap (regardless of what it cost). Top notch cables are usually semi-airspaced (not a foam insulator but polythene - either extruded with triagular air spaces or with a big gap and a spiral of polythene running up inside.
The other thing is the aerial - again I don't know but I imagine it has to be very broadband given the number of channels on digital. Normal TV aerials come in groups A B C and C/D depending on which transmitter you are receiving - I'd imagine an aerial for digital may have to cover the whole UHF TV band which from my experience means a log periodic design would be best (you could use google to see what that is).
Sorry - after typing all this tosh I realise it's probably of limited use to you.
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