Example: wavelength of a 200MHz wave = 300,000,000 / 200,000,000 = 1.5 meters
Example: wavelength of a 380MHz wave = 300,000,000 / 380,000,000 = 0.79 meters

So my lecher line needed to be at least 0.79 meters and at most 1.5 meters. Actually, a lecher line that is half the wavelength will work too if you're short of wire. Mine was only 1.12 meters.

 

파장의 절반도 잘 동작한다고 함.

 

https://rimstar.org/equip/lecher_line.htm