Input impedance of the antenna is 200- ohm so it is possible match the antenna with 50- ohm coaxial cable with help of 41 transformer. A quad antenna is a type of directional wire radio antenna used on the hf and vhf bands. Like a yagiuda antenna (yagi), a quad consists of a driven element and one or more parasitic elements however in a quad, each of these elements is a loop antenna, which may be square, round, or some other shape. It is used by radio amateurs on the hf and vhf amateur bands. Quad antenna, how to build a quad antenna for ham radio use category is a curation of 85 web resources on , two portable antennas for 6-meter, the cubical quad is beautiful, designing vhfuhf quad antenna. Resources listed under quad antennas category belongs to antennas main collection, and get reviewed and rated by amateur radio operators. Rear of the reflector rg402 feedline and female sma connector. Mark out a rectangle 231 x 116 mm to form the antenna reflector. Double sided pcb antenna reflector marked out 231 x 116 mm. The quad antenna in all its forms has become the preferred antenna for the members of our club. Over the years many designs were built for the different ham bands. When we built the first version of the double twin quad antenna for the two-meter band we were very surprised, if not deeply impressed, by its apparent performance.