J-type antenna size online calculator

App Description

Because of its simple production and easy material selection, J-type antenna has been favored by FM
transmitter enthusiasts. It can be used with air-conditioning copper tubes of about 1 mm. It can be produced
according to the calculated size and can achieve good results without professional tools.

Usage example

The input frequency can be used to find the short length of the J-type antenna, B is short, C is short,
and D is short.

Input frequency: 100MHz

Output results:

Section A length: 7.05 feet, 84.60 inches, 2.149 meters

Section B Length: 2.34 feet, 28.8 inches, 0.713 meters

Section C Length: 0.23 feet, 2.76 inches, 0.07 meters

Section D Length: 0.22 feet, 2.64 inches, 0.067 meters

Note

If you can't find the copper tube, you can also make it with 2.5 square copper wire.