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a counterpoise is the wire that the driven element works off of. in other words its the other half of the antenna. counterpoise length is the same as the driven element, or a 1/4 wavelength if used with a vertical antenna configuration. in your case being rx only you could probably not use one at all or ground that terminal to earth without to much performance degradation. also you need the unun (unbalanced to unbalanced), not a balun, (balanced to unbalanced). your connecting unbalanced coax to an unbalanced antenna. for the coax connection just get a cheap sma to so239 adapter

[QUOTE="groundwire, post: 811274, member: 42117"] a counterpoise is the wire that the driven element works off of. in other words its the other half of the antenna. counterpoise length is the same as the driven element, or a 1/4 wavelength if used with a vertical antenna configuration. in your case being rx only you could probably not use one at all or ground that terminal to earth without to much performance degradation. also you need the unun (unbalanced to unbalanced), not a balun, (balanced to unbalanced). your connecting unbalanced coax to an unbalanced antenna. for the coax connection just get a cheap sma to so239 adapter [/QUOTE]

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