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Which antenna is better: 5/8 wavelength vertical or a J pole? Frequency of operation is 145 MHz = 2 metres. The 5/8 wavelength vertical has a loading coil. There are losses in the coil. The J pole has a quarterwave matching stub. The matching stub provides an out of phase current which means that there is a cancelling field close to the radiating element. Also the J pole is end fed, which means the transmitter is not connected directly to a maximum current point. Does the J pole have a disadvantage because of the cancelling field from the matching stub and the fact that it is end fed? Also consider gain and angle of radiation. |
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