AO-40 2.4 Ghz 3.5 Turns LHCP Helix Feed 3.5 turns LHCP helix feed designed for AO-40 reception with a small 90-120 cm dish. The helix is made in 4 mm copper tube silver coated (15 micron) while reflector is copper nichel coated. Helix support are in teflon while good quality N male connector is screwed to reflector in order to fit perfectly Transystem AIDC converter family and California Amplifier. The main support is square alluminium 14mm x 14mm and all screws are stainless steel.