Not really at liberty to say the operator of the aircraft. You know how touchy management can be! Like the paint idea. Will check that out. Obstructed antenna definitely.
Our lower twin blade (bearing antenna) is surrounded by wire strike, FLIR disconnects, other antennae, then further back skids and the Big float bags.
We also have a lot of added copper foil under the top single blade antenna on the composite racing car fairing.
Flying bull.
Great pic of that lower twin blade antenna on the BK117.
I presume that there is an added ground plane inside the composite radome.
Is your installation performing well?