aside. I have the second antenna; the weight of all that wire and the
coax with a ferrite balun results in a significant sag. I'm wondering if
> That statement is true - however ---
> The problem is not radiation from the conductor, but how to get the RF
> current into the conductor and not in other unintended places.
>
> For those who want to build their own antennas, I suggest starting with
> a resonant dipole fed in the center. That provides a good match for 50
> ohm coax, and a good current mode choke (balun) at the feedpoint keeps
> RF from flowing back onto the outer shield of the coax which can create
> a lot of RF in the Shack.
>
> Off Center Fed, and End Fed antennas can be made to work with more care.
> The feedpoint impedance does not match coax, and special care must be
> used to keep the RF on the radiator rather than coming back into the shack.
> I realize that OCF and End-Fed non-resonant antennas are popular because
> they can be used on multiple bands, but there are problems feeding them
> while keeping the RF on the radiator and not in unintended places such
> as the shack.
>
> For those who want multiband operation, I still suggest a center fed
> radiator fed with open wire or ladder-line to a good current mode choke
> balun at transition point to coax is a better choice than OCF or end-fed
> antennas - keep the coax short and use a tuner that can match the
> resulting impedance.
> Make the length of the dipole approximately the length of a half-wave at
> the lowest operating frequency desired. It will be more "tame" for RF
> in the Shack than many OCF or End-fed antennas.
>
> 73,
> Don W3FPR
>
>
> On 12/6/2018 8:56 AM, ANDY DURBIN wrote:
>> "RF current into a conductor will radiate, even if it's at eye level."
>>
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