On Wed, 17 Mar 2010 08:22:52 +0000, Ian Jackson
wrote:

End fed antennas are an implementation risk.

What's an 'implementation risk'?

Having it come out mismatched, a very much higher probability.

Have you considered a vertical dipole hung from the roof structure, and
taking the feedline away horizontally for a couple of wavelengths, then
down. You could make it a folded dipole (TV ribbon?) and use a half wave
coax balun.

Are you suggesting that a centre-fed dipole is better than a J-Pole?

A center fed dipole is simpler to tune and keep tuned.

There is absolutely no problem with the J-Pole / Slim Jim type of
antenna, or with feeding it.

The majority of users who come here for solutions to theirs would
suggest otherwise.

73's
Richard Clark, KB7QHC