"Basil Burgess" wrote in message
...
Thank you for your response

I'm afraid I don't have a way of measuring the SWR at the coax.

Should I consider connecting the balun directly to the slinkys rather than
at the end of the twinline? Should the twinline be supported so that it is
not lying on the roof?

Or should I just dismantle it and go back to positioning the GSRV Mini.
That, at least, is a copper dipole.


As Cecil said , it is hard to tell you what to do with the limiated
information you have given. Nothing simple beats the good old dipole
antenna. Problem is it is mostly a one band antenna. I have up an off
center fed antenna and it seems to work fair for all the harmonic bands.
The swr is a bit high on the WARC bands. It is about 130 feet long with a
4:1 balun in the center and fed with rg-8x coax.

Even with the antenna you have up you should be able to work something if
the rig will load it. It may be that the internal tuner to the rig is not
able to match the antenna and most of the power is not getting out of the
rig. The inernal tuners are only good for about a 3:1 or less swr to the
antenna on most rigs.
Cecil mentioned an expensive MFJ device. It is probably way too much over
kill for most hams. One of the least expensive SWR meters will tell you if
the antenna is anywhere in the ball park and which way you need to trim the
antenna if you take several readings across the band.