GSM 800 mhz interference Filter (Hersham KT12)

Hi all, someone may have one of these old type 800 Sculling around in the TV Stuff Box
Thinking it could be Cellphone interference, causing pixellation
Which subsequently turns out to be a Poor signal,
they are becoming obsolete as now need to be 700 mhz for 4/5G
Can pickup almost anytime within ~6 mls of Walton Regards Paul
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