The Royal Air Force wants to swap out the Sky Guardian 200 radar warning receiver (RWR) on the Puma helicopter and replace with a variant of SEER RWR from Selex ES.
By Sgt Jack Pritchard RAF (http://www.defenceimagery.mod.uk) [OGL], via Wikimedia Commons
The Seer RWR is E-J band, but can be configured with extensions to operate in the C-D and K bands, according to Flight Global.