In message , Mark S. Holden
writes
BobS wrote:
I live on the 2nd floor of a condo (no outside antennas allowed) with
a random wire (60') from my R8B, out the window, and thrown over a
tree branch. No separate feedline; just one length of thin wire from
radio to tree. As expected reception is compromised with excessive
noise. Can anyone advise if there is a way to reduce the noise? Can't
have a ground rod. Don't want to move. Would an active antenna be an
improvement or a waste of money? I do understand that I'm never going
to have a Good setup, but just looking for some improvement.
Thanks...Bob
Remove MYHAT for email response

An impedance matching transformer might help.

Here's a link to simple plans for making a 9:1 transformer:

http://www.kc7nod.20m.com/new_page_1.htm

I can't see a 9:1 transformer making one scrap of difference.

Its normal application is to enable you to locate an antenna remote from
house (and hence from sources of electrical interference), and bring the
signal back the receiver via screened (coaxial) cable. The purpose of
the transformer is to help minimise the 'pot-down' of the antenna signal
on those frequencies where the antenna impedance is a lot higher than
that of the 50 or 75 ohm coax.

There really should be a good ground connection at the
antenna-transformer-coax interface. If there isn't, the 'ground' will
via the braid of the coax. However, unless the coax braid can be
grounded, it will effectively be part of the antenna, and you are likely
to get interference pickup on the coax. Things might be a bit better
than simply bring the antenna wire directly to the radio, but I wouldn't
count on it. An active antenna would probably be a better choice, but
needs investigating.
--
Ian