Each2 Meter FM Yagi driven element is fed with an efficient beta match. Each parasitic element is solid 3/16 in. aluminum rod mounted through the boom. Their boom clamp accepts up to a 2 inch OD mast. Specifications: VHF Beam Antenna Type: Yagi VHF Beam Antenna Elements: 3 Antenna Power Rating: 500 W PEP Beam Antenna Boom Length: 43.50 in Builda 4 Element 2 Meter Yagi, using a Stellar Labs (30-2460) Outdoor FM Antenna ( ). Also references ARRL's Isyour Ham Radio HT rubber ducky letting you down? Do you want to transmit a stronger signal to the repeaters? If so, I'll show you how to build a two meter 315. Table from the Electrical Conductivity of Metals. With copper being twice as conductive as aluminum and 6 times more conductive than steel, it makes an excellent choice as an antenna material. The increased electrical efficiency means more of your RF energy will go up and out the antenna and not be trapped, creating heat energy. This3 element 2 meter Yagi is nothing more than an "adjustable match" half-wave dipole antenna (the driven element) using direct feed 50 ohm coax, mounted between the other two elements which are the reflector and the director. It will give you about "7db" gain according to the author. The boom and mast are made from 3/4-inch PVC plumberâ Formost VHF uses, it is the pattern shape, with its very high front-to-rear ratio, that holds more interest than the antenna's gain. Fig. A shows the azimuth pattern of a 2-meter Moxon when the antenna is vertically oriented and, hence, vertically polarized. Patterns are shown across the 2-meter band for a model designed for 146 MHz. 2mantenna dimensions: Oblong 360 mm wide x 690 mm high, 1/6th of a wavelength wide and 1/3rd of a wavelength tall. The oblong ratio is 1/3rd across and 2/3rds high. My finished antenna wire length is 2.130 metres, which includes an extra 15 mm on each side for feed point strain relief. The finished length will depend on the wire diameter used. Cutthe tape at 35 1/8". This will be the director of the antenna and will attach to the front of the antenna. Cut two 17 3/4" long pieces of the tape. These will serve as the driven elements. Cut an additional element from the tape. This will need to be 41 3/8". This is the reflector element. Inorder to use our antenna calculator, you'll need to know the frequency on which you want your antenna to operate.. Your result will consist of: Your total antenna length (L);; Length of one arm of the antenna (l); and; Wavelength, as well as its portions: 1/2, 1/4 (it'll also allow you to use it as a 1/2 wave dipole calculator).; In the advanced mode:. You may enter the diameter of your Step1 Cut three pieces of PVC tubing. One piece will be 11 1/4 inches long and the second will be 6 7/8 inches long. These pieces will make up the support boom for the antenna. The third piece can be any length, it will be the handle for the antenna, so give yourself about a foot or foot and a half. Whatever is comfortable. IwHVo.