Attached is a picture of the PAW in the loft space.
The roof was dry no cloud below the grob.
Just had a departure from about 800 yds away from my house
107ft Sig 189
Hi again Eric,
Not too bothered about the Grob, I'm quite happy that was Mode S - as I say, the signal strength fits with an aircraft using a higher power transponder (such as a Trig TT22 or similar) - which outputs up to 250 Watts as opposed to my TT21,s 125 Watt maximum.
The problem is the entries that Alan is saying are definitely ADSB equipped aircraft, so should be showing a DISTance from you in your traffic table. One thought was attenuation from a wet roof, but you say the roof wasn't wet - I take it it's not made of, or lined with metal (e.g. aluminium foil on insulated plasterboard)?
Another thought was that you are very near Blackpool and quite close to Wharton. When CAT is on the ground, the ground radar returns are effectively mode S at very high power, and show up as such on the PAW traffic screen. During testing near Edinburgh Airport, we noticed these were often strong enough to trigger Mode S 'Danger' alerts from well over a mile away, which is why we developed the Ultra Short Range setting specifically to deal with this type of scenario. I also noticed that some of them don't engage ADSB until well into the climbout, which might have explained aircraft less than say 2,000ft, but not at the heights yours are showing at, so doesn't help to explain those.
I will give it some more thought.
Regards
Peter