I appreciate the list. As more money becomes available, I'm going to look at upgrading the antenna. I do like this on no your list:
https://www.amazon.com/ADSBexchange-5-5dBi-N-Type-Female-Antenna/dp/B089Q4BVCB
I'll just need to convert from an N connector to the SMA on the receiver.
I am running the RTL SDR v3 dongle with this antenna:
https://smile.amazon.com/ADSBexchange-5-5dBi-N-Type-Female-Antenna/dp/B089Q4BVCB/
Was eyeing this fitler after your reply:
https://smile.amazon.com/ADSBexchange-com-1090-Mhz-Saw-Filter/dp/B09RPKHQ6S/
This is similar to both above, not sure it ships free from Amazon to UK.
https://www.amazon.com/ADSBexchange-5-5dBi-N-Type-Female-Antenna/dp/B089Q4BVCB/
Either one will work. FA one requires you buy coax. Airnav one works but included coax is lacking.
No matter what you decide, the important part is ADSBx. :D