building out a 5 inch for some longer distance cruising, nothing crazy legal-wise just want solid reliable link out to maybe 3-4km line of sight. im currently running Walksnail Avatar on my freestyle quad and love it for latency but ive heard mixed things about how it handles when theres a lot of RF noise around. thinking about whether O3 Air Unit makes more sense for this specific use case.

the areas i fly have a decent amount of farms with equipment running, some industrial stuff maybe a km away, and the occasional power line corridor which i know is a nightmare for signal. lat time i flew the Walksnail build out past about 1.5km near a substation i got some pretty gnarly breakup on the feed even though RSSI looked ok on the goggles. that part confuses me, like how can signal strength look fine but the video still falls apart.

anyone have real world comparisons between the two in environments like that? not looking for spec sheet stuff i can read that myself

the RSSI looking fine but video breaking up thing is because RSSI is just measuring signal strength, not signal quality. near a substation youre getting all kinds of broadband noise that degrades SNR even when raw power levels seem ok. its a pretty common trap to look at RSSI and think youre fine when the actual link is struggling.

as for O3 vs Walksnail in dirty RF environments, in my experience O3 holds up a bit better but its not dramatic. DJIs frequency hopping and error correction is genuinely good. Walksnail has gotten better with recent firmware but it was playing catchup for a while. that said if latency matters to you at all the Avatar system still has an edge there so it kinda depends what you're prioritizing for this build.

honestly i'd just go O3 for long range stuff and keep the Walksnail on the freestyle quad. trying to optimize one system for both use cases is how you end up with something mediocre at both. O3 Air Unit with a couple of patch antennas pointed the right way will give you rock solid link at 3-4km even with some interference in the mix. ive flown mine through some genuinely sketchy industrial areas and it just handles it, the adaptive bitrate does its thing and you might get a drop in quality but you dont lose the feed entirely which is what matters when youre far out