This the inside of the empty coil housing. The cover is using the same type of closed-cell foam gasket as the EHU. The output pigtail of the coil (seen at the bottom of the picture) is actually a heavy gauge stranded wire with very thick insulation (not coaxial) - the OD of the cable is the same as RG-8X. The male N connector is installed onto the cable in a way that both - the center pin and the the outside shell are connected to this wire, making the ground screw of the EHU RF hot!