I'm using a Raspberry Pi 4 Model B / 2GB with a JetVision ADS-B USB Dongle (R820T2) and a handmade antenna (a very simple dipole). As i live in a flat without access to the roof, it is placed on the side of the building on 1st floor with two more floors above. Not really ideal, and stil it works very good ;-) At the moment i was looking up for your feed in the stats, you had 97 peers and 98% health. Nothing wrong with that, i guess?
In 4A having many peers is really easy. If the other people have large range you don't even need large range to peer with them. And many people in 4A have very good receivers. Anyhow as i said the number of peers is capped so it's not a measure for how good your receiver is ..... Actually currently it just says you have lots of other receivers closer than 40 km (it will only accept 30 or so receivers to sync with you that are further than that)
