A small feeder for FR24 realized using a small SDR dongle and a RaspberryPi Zero; connected to a small vertical magnetic antenna (for 1,2 gHz), it detects and bounce back over internet  (FR24 site) the received signals of ADS-B in the range of about 70NMs around my area (with obvious limitations); the feeder code is T-LIQL10 (enable filter for T-LIQL10 on FR24 site to see my traffic only); it's on 24/7.

Looking for a web SDR receiver I found this cheap but effective project based on a RaspberryPi system; can be explored on https://www.openwebrx.de Coupled with a RTLSDRv3 dongle is able to tune from HF to SHF and decode a tons of digital signals. I use to keep it connected to my HF yagi (40 to 10 Mts) and to a vertical V/Uhf antenna. Several bands can be selected; do not expect extreme performance. My device can be reached at
www.ik5zve.addns.org:8073​​

Funny experiment with a Lilygo TTGO module to take advantage of the LoRa traffic APRS on 433MHz; it's on the top of my home roof, a solar panel provides recharge for the internal battery. It's not connected to the web so it only operates with bounced received signals on LoRa 433Mhz APRS.
IK5ZVE-10 is the call sign, visible on https://aprs.fi

More funny than the LoRa iGate is the APRS tracker; based on the Lilygo TBEAM wireless module, is able to broadcast your GPS position over the LoRa APRS net over 433MHz; very sensitive and effective, my mobile can be seen as IK5ZVE-5 over https://Aprs.fi website.