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Just because it is new does not mean it is not an existing source you are seeing. It could be a mixing product from a change somewhere making DAB or Data or 4G or 5G signals appear. I originally thought you said it was 8 MHz bandwidth, which would be DVB-T, but if it is 2 MHz chances are it is DAB. That's at 225 MHz so easy to filter out, but it might not be the cause. I had pagers around here just above and just below that used to be really strong making any SDR unusable without filtering. The way to find the strongest signals is to put attenuators on the front end until the interference goes away and then scan the spectrum for strong signals. An FT817 will only find things if you know where to look. It's very unlikely this interference is really on 2m. If there is a masthead pre-amp in line, they can suffer too. That would explain it appearing on other radios.
I'd hope that it would not radiate much if its a decent spec device, but a few feet away is a bit of a pain. My triband colinear is on the chimney directly above it too.
Something like these: https://www.ebay.co.uk/itm/4pcs-5-0mm-C ... 2288602455
Picture shows the worst part. There's a strong 'raspy' carrier (possibly carrying some form of mod) on 79.925 and these data blocks, noteworth is the third one across which seems to have 3 sub-bands that drift to the left.
Hoping the ferrites cure it....