BD7IBI 13.700 - 56.000MHz Shortwave Radio Antenna High Quality IBI-VR Positive V Antenna for Vehicle Description: - The frequency of the antenna is 13.700-56.000mhz, which can naturally resonate according to the length of the pull rod. If a sky adjustment is added, 3-60mhz resonance can be achieved.

Specification: - Testing antenna: IBI-VR 3rd generation - Testing height: level + 2 meter (raise by 4 meter + stand wave) - Testing frequency: 14.270mHz±100kHz/DIV SWR and Z/R parameter 14.00mhz-56.00mhz SWR horizontal bandwidth 300khz-700khz Instruction: - The resonance length of the rod oscillator at 14.270Mhz is about: all the rods are fully pulled out, and one section of the oscillator is only pulled out 2cm, which means it can resonate at 14.270Mhz. If there are other frequencies to use, please refer to the following instruction: The calculation formula for the length of a 1/4 wavelength antenna: speed of light/frequency/4 x 95% = (single arm) length The calculated length of 14.270MHz antenna is 299792/14.27/4 x 95% = 4993mm The calculated length of 21.400MHz antenna is 299792/21.4/4 x 95% = 3330mm The calculated length of 29.60MHz antenna is 299792/29.60/4 x 95% = 2667mm Precaution: - Be careful not to use excessive force when pulling out and retrieving.

The rod is a precision product and is prone to damage! This antenna is a 1/4 wavelength V-shaped DP antenna, with a single side oscillator length of 1/4 wavelength.

Due to the influence of distributed capacitance, there may be situations where the oscillator length needs to be increased or decreased during actual installation. Package Included: - 1 x Epoxy Resin Socket + 304 + 201 Screws - 1 x Balun for Positive V - 2 x IBI-5.6m Stainless Steel Rod. Usually it costs about 30USD-50USD. If you receive the item that not satisfied or defective, please do not open case and kindly notify us within 30 days.