This product is a short wave antenna making kit, including base plate and fixed structure, suitable for the use of 20mm diameter support rod or tube and wire vibrator convenient to build a antenna (insulation tube and vibrator need to be prepared) The kit includes a 5 mm epoxy base plate, Size 270mm x 140mm, CNC machining holes for accurate positioning, 2.5 mm stainless steel fixation mechanism, 12 sets of U-cards and matching screws and nuts (see picture), all made of stainless steel MOX0N antenna can be seen as a deformed 2-unit , feed point impedance 50 ohms, can be fed directly or add 1: 1 barron is better, the maximum gain is about 6dBi, but the front to back ratio (F/B) is amazing and can reach more than 25dB, the bandwidth is excellent, and the radiation Angle is more than 70 degrees, which is very suitable for radio racing. It is also a convenient wild frame antenna. If used in the high wave segment (12m,10m,6m), and the pursuit of and cheap can use 20mm PVC pipe construction, such as PVC pipe soft need to consider the sagging problem and compensation in advance, if used for 15 meters or lower band, you need to carefully select high hardness insulation material as support pipe. Color: As Shown Material: Metal Package Contents: 1 x Shortwave MOXON Antenna Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.