Building my own ADS-B receiver

Nothing notable here frankly. "Get a Raspberry Pi, get a receiver dongle, hook them onto the wrong kind of antenna and it will still work after a fashion."

ADS-B monitoring is neat, ended up being the slippery slope that nudged me into getting an amateur radio license after realising how good/cheap SDRs are :)

I hope your filter and LNA come in soon! Beyond getting a high-gain 1090MHz antenna as you've done, I found a filter + LNA made a massive difference to my coverage area- likely in part because my SDR's frontend was being overloaded by other nearby transmitters. I'll regularly pick up flights going over Northern Ireland, the Isle of Man, and North England from Glasgow.

The rtl-sdr blog folks (used to? can't seem to find active listings) sell a combined filter+LNA that's powered off bias tee on the existing feeder run.

adsb.im also looks cute for a single-purpose SBC, I've been running sdr-enthusiasts/docker-adsb-ultrafeeder for a while to allow my Pi to run other services.