[Antennas] J-Pole antennas

[Danny K6MHE]

Ron Youvan wrote:
> [Snip]
>    My normal way to feed them is to run the "foam RG8/U" up inside of the shorter element to a hole 
> made at the correct location (determined empirically earlier) where both the inner and outer coaxial 
> cable exit, the other to be soft soldered there and the inner goes across to the longer element 
> where it is soft soldered.  I make both sides of the "short" at the bottom of the stub with 
> plumbing "T"s and under the short element I add enough copper tubing to be 18 inches long below the 
> "short" this is a "sleeve balun" and my antennas do not suffer from the usual sensitivity to the 
> feedline dressing.
>    When I solder the coax I clamp the wires to the copper pipe with very small aviation hose clamps 
> (screw clamps) and I do a final test moving the inner up and down slightly for the best match were I 
> want it, (usually at 146.00 MHz) then I soft solder the wire to the (per-cleaned) copper pipe under 
> the clamps, which does not stick to the stainless steel, the clamps come off easily.
>    I use 5% silver 94% copper hard solder to put the "J" pole together.  (1% phosphorus)
>    The impedance of the feed line is not critical, any impedance can be matched the way I build them.
> I sweep my antennas with a "return loss bridge" to tune and match them, before during and after 
> construction.
>   
How do you attach you antenna to a mast and do you use a conductive mast?

Danny, K6MHE