Plane / Planes / Aircraft / Aeroplane / Airplane appreciation

Every few months I get a leaflet through the door, "buy a photo of your house from above!!!".

I could ask but I don't think they'd tell me that :)

Their reply did make me laugh because the weather was absolutely beautiful when they sent that tweet ('reasonably good')!

At the risk of going down a right wormhole, I am casually interested in this ADS-B stuff. Would one of these be a decent easy/budget option?
https://thepihut.com/products/flightaware-pro-stick-plus-usb-sdr-ads-b-receiver

If I get one will I finally be able to track the MI5/Met spy planes that are always flying over East London?

Also, my unused TV antenna socket is right next to my desk, could I plug it into that somehow with a suitable adapter cable?

Nice. I wonder who commissions these surveys? Most of the ones I have spotted were being conducted very close to Heathrow

Could also be calibration flights, although if that was the case I guess that it might be obvious from the flight path.

Edit: or from the aircraft, so probably not!