said by warwick:
I presume this upper limit has much to do with the actual length of wavelength itself?
If you still want to use heliax in the future for the 5.8 GHz, the 5/8" foam LDF4.5-50 looks like it would work good for you. The attenuation is 4.765 dB/100 ft. per the Andrews spec sheet. The list price is ~$6 per foot...trade pricing less.--
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