Was I the only lucky one?

Hello All,

Today I have an unbelievable ADS-B peak range of 438. Was I the only one this morning?

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It looks like it came from Poland.
IDK, with the war, might be spoofed/changed GSM signals? Testing?

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Not only Poland, also somewhere in Danmark.

Nothing special noted here at that time.

That spike might be a fluke.

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Nah … that’s pretty likely to be ducting.

Check /?ptracks … click the tracks over poland / see how many there are.
Cross check with an aggregation site.

Thank you for the reply and possible answer. Unfortunately I was too late to see the tracks, as it is more than 24 hours ago. Will mark your answer for the future

That is pretty much the norm at my location during the summer:

Being that contrary to the last graph this graph is in nautical miles … that’s a lot.

I got some movement

500-520 nautical miles? IMO that is unheard of…

Not completely. (http://essexradar.co.uk:1085/graphs1090/)

Distance of the antenna to a body of water is critical, antenna height in relation to that distance to the water is probably also important.

It’s not unheard of but it’s an impressive average. I’d love to see the one year or two year graphs @fishymamba


I only have one year on this current Pi. I’ve also made lots of setup changes along the way.

As you can see the ducting goes down significantly in the winter. The drop in range you see near the current date is due to a freak storm system that passed in the area.

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Really interested to know what your exact setup is.

It’s very good, it looks as though you have a lot of traffic off to the west. Any chance of a screen grab of your map when it’s got aircraft at range please, I’d love to see it.

520 nm? That’s 960 km! Or 600 miles. Consistently? I don’t know of anyone with this range, to me this is suspicious…
It’s like BOTH the plane and antenna are at 45,000 ft!

If antenna drops to about 4000 ft, the airplanes at 45,000 ft (and there are not many there) would be at about 600 km:

IMO he has two antennas combined in one feeder, see the big jump in positions “far away”?
I can do that if I bring in my son’s data 3000 miles away, and it won’t disrupt the MLAT because there will be no overlap of signals from same planes to disrupt it.

fishymamba ADS-B Feeder Statistics - FlightAware

I think you are being a bit hard on @fishymamba - you can certainly get ducting over the distances mentioned here. See this wikipedia article, which specifically mentions the Persian Gulf as an area where ducting is common:


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Doing radio horizon calculations when it’s ducting over the water of the Persian Gulf just isn’t helpful.
But i suppose that’s not clear immediately by what’s been posted in the thread.

I was skeptic at first but the data looks plausible to me.


Well the FA graphic has a max range bucket where it places everything further than a certain distance.
So ductin in a certain direction means all the aircraft further away will add up to a high number.