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I also want to ask this as well.  How can a person tune an antenna with a 1/2 wavelength for tuning of an antenna, then use a 50ft or 100ft main run.  Doesn't line up with the 1/2 wavelength rule being used for tuning.  What I am asking is why would I need to tune the antenna with a specific length just to null and void this length with a 50 or 100ft run of coax that normally is used for most installs of base stations. Or does everyone do it different??