The first part of that statement is correct, but the last part isn't.
It's not coupling from the balanced dipole to the coax that causes shield currents ... it's the simple fact that the antenna is balanced and the coax isn't.? You may get away without a common mode choke, but it is more likely that not having one will result in some amount of feedline radiation, pattern distortion, and/or unwanted pickup.
Horizontal dipoles and yagis typically have the feedline perpendicular to the antenna and they still need a choke for proper performance no matter how high the antenna is (and therefore how far the coax remains perpendicular to the antenna).
73,
Dave ? AB7E
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On 11/30/2019 12:10 PM, KV5R wrote:
Also, it (half wave vertical dipole) is inherently balanced, and if you bring the coax away from it perpendicular for at least 1 wavelength, you shouldn't need any chokes.
73, --KV5R
