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18' IS a PHYSICAL 1/2 wavelength but NOT an ELECTRICAL 1/2 wavelength.Electrical wavelength is found by taking the physical length and multiplying it by the velocity factor of the cable.RF travels slower in coax cable,or any other type of transmission line, and the velocity factor plays a HUGE role in length calculations because of it.

[QUOTE="Captain Kilowatt, post: 88654, member: 39"] 18' IS a PHYSICAL 1/2 wavelength but NOT an ELECTRICAL 1/2 wavelength.Electrical wavelength is found by taking the physical length and multiplying it by the velocity factor of the cable.RF travels slower in coax cable,or any other type of transmission line, and the velocity factor plays a HUGE role in length calculations because of it. [/QUOTE]

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