Hi we have lost freeview tv on all three TVs, predominantly watch satellite so not exactly sure when this happened. We have a mast aerial on the roof, a splitter booster in the loft, the power supply for this is behind the main tv. We also have a filter between the the aerial and booster which is meant to stop interference from 4g signal. Based in swindon and pointing at mendip mast / repeater. Now any of this could fail I guess or a break in the cabling itself. I have checked the obvious that everything is still connected and it all appears to be ok. Also the lights are on the booster so it is getting power. Now I am wondering if I could purchase a signal meter to help me narrow this down further is that the right thing to be doing?