If your 75 ohm coax has a steel/copper coated center conductor, be sure to test 
it for loss on
the lowest frequency band you will use.  I experimented with a steel core 160 
meter
antenna and found it had some additional loss and probably due to the inductance
it could be shorter for resonance (10 % perhaps ??) so I abandoned the idea.  
Never noticed the effect on higher frequencies. 

Sent from Mail for Windows 10

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