GUIDELine® circular waveguide is the best choice for long vertical runs. It has substantially lower wind loads than equivalent rectangular waveguide, allowing it to be used on towers where rectangular cannot. With attenuation up to 50% lower than corresponding rectangular waveguide, it is the most effecient transmission line available. You may be able to use a smaller, less-expensive transmitter! Unlike truncated elliptical waveguid, on-site tuning is completly eliminated by the use of cross-polarization canceling pins.
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