Flightradar24 ⁽¹⁾

I have been running an ADS-B decoder here for many years now and feeding flightradar24. However, yesterday I got an email alert that the decoder was offline. it seemed ok locally as the status said it was connected but it was no seeing any aircraft. This was last night but there were plenty of aircraft near enough. On further checking via the flightradar24 website it seemed the maximum distance seen was just 2 miles. One aircraft took off from the local airport and the decoder did see it, but only for a short while. So, off into the loft. I swapped the dbv dongle. No change. I took the preamp out of curcuit. No change. I installed the latest fr24feed. No change. Hmmm. Then it was time for bed... This morning I checked the collinear using the TinyVNA and it showed it was fine. I swapped the antenna lead that came with the dongle for an adapter type. No change! Back to the software then. I have not changed the setup for ages, in fact not since I migrated the decoder from a Pi to a Linux box. And it was always fine until now. Shutting fr24feed and dump1090-mutability down…