The SDR is one of these
First attempts with the supplied antenna (using the lid of a metal biscuit tin as a ground plane
) were mediocre and a poor SNR.
Next effort was using an MCX adapter to the TV antenna: better, but still not brilliant (quelle surprise!)
An MCX to BNC adapter connected to a 4' whip antenna off an old boat is much better for the marine band (quelle surprise!).
A disc-cone is on the shopping list.
There are various bits of software for showing ADS-B positions, met sat images etc.,