Eric Performed checks on alternative equipment, there is heavy radio interference in and around my house. With signals splashing right across whole swathes of the band on a regular basis. Really annoying actually. imgur.com/Rc8UwgI You can see the horizontal streaks on this waterfall. The same signal occurs in multiple places at once and has incredibly wide width.

Martijn Any idea what could be causing that?

Eric Best guess is a local cab service or something like a machine in the local fire station, the signals sound like the sort of thing you get at the start/end of data transmissions.

Martijn Data transmissions... Time to get cracking! Hahaha