What are filters and how are they fitted?
at800 domestic/household filters are small boxes which block 4G at 800 MHz mobile signals and in most cases enable you to carry on receiving watching Freeview as normal – we provide them free of charge. Each filter is smaller than a pack of cards and needs no batteries or external power supply. It will normally plug into the lead between the TV and the aerial. If you have a TV signal amplifier or booster, the filter must be fitted between the aerial and amplifier. We have tested each type of at800 filter to ensure it works correctly in the UK.
You can also download the filter fitting instructions here.
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- I am missing some Freeview channels. Is this caused by 4G?
- How will I know if my TV is affected?
- What should I do if I think my TV is being affected?
- What will happen next?
- How do I arrange for an at800 engineer to visit?
- Can I fit the filter myself rather than have an engineer visit?
- If my TV is affected, how quickly will you resolve the issue for me?
- Is it true that millions of homes might be impacted?
- I live in London, will I be affected?
- How will at800 let me know if my Freeview may be affected?
- My neighbour has received a postcard and I have not. Why?
- Will 4G affect TV received through satellite or cable?
- Will TVs in caravans, campers and narrowboats be affected?
- What are filters and how are they fitted?
- How can I get a filter?
- What if I have a set-top box?
- What if I have an indoor TV aerial; can I still attach a filter?
- What if I have more than one TV running Freeview?
- What if the filter doesn’t resolve the interference?
- Can I get more filters if needed?
- I am moving house, do I need to take my filter to my new home?
Our online diagnostic tool will help you identify what might be causing disruption to your Freeview service.