Hi Ross

300ft of RG213 maybe? Thats about 3.5dB loss at 30MHz assuming a 1.5:1
VSWR. At 14MHz its about 2.4dB loss.

LMR400 at about the same diameter as RG213 is just under half the loss.
Its also cheaper than RG213 but a bit harder to terminate into connectors.

RG6 may also be usable and much cheaper (being TV/CATV coax) as it has
only slightly more loss than RG213. Its 75 ohms though if thats an issue.

(http://www.ocarc.ca/coax.htm)

There will be a much lower loss if you use open wire feeder... You could
no doubt use broadband baluns at each end to change back to coax. You
could also make your own feeder probably much cheaper than using coax.

I seriously dont think the line loss figures in the coax mentioned above
are important for HF work. You are of course losing half your power at
higher freqs.

Cheers Bob W5/VK2YQA

Ross Biggar wrote:
I am putting up a second tower , but it will be about 200feet from the shack
and about 70feet high.
What coax is recommended to reduce loss to a minimum,and to feed a multiband
beam with a 2kw amplifier.
Hard line excepted due to cost.
Regards
Ross
ZL1WN