Extension cable for ADS-B USB Dongle (R820T)

Hi all,

Using the ADS-B USB Dongle (R820T) with the aerial that came supplied with it without any problems.

However due to moving house, and having this in a different location (currently indoor now :( ) I need to extend the cable for the aerial, so it can be placed outside. The problem is... I can't find one that will fit this! I am in the UK, does anyone know where I can find one? I think 5M should be enough.

Cheers!