[Antennas] Coax Balun (Unun or whatever)

[Philip Atchley]

Hello,

Later next month a new HF-2V vertical will be replacing the roof mounted 
(sheet metal roof) Hustler 6BTV on the 75, 40 & 30M bands.  The Hustler 
is fed with a length of RG-8x (mini-8) coax and is wound into a Balun 
near the antenna.

The HF-2V will be fed with about 30-35 feet of new RG-213 coax (paid for 
with "labor").  The antenna will be worked against the sheet metal roof 
groundplane (as the 6BTV now is).

Questions:  Should I wind a "Balun" of a few turns near the HF-2V feed 
point?  If so, what is the 'suggested' coil diameter/number of turns  
(80,40&30M) for RG-213?  I've not worked with this particular coax 
before so I'm not sure how "stiff" it is.

The balun/coax will be laying directly on the sheet metal roof, so I 
don't know how beneficial  winding a balun would be?

73 de Phil  KO6BB