On Wed, 23 Sep 2009 11:45:31 -0700 (PDT), KD7HB
wrote:

So, try running a wire from the phone base unit to the outside of your
house. Experiment with length and placement to see if you get improved
distance. My electronic bell runs in the 300 MHz range, but may well
work for your unit, as well.

Any wire that is excited at a wavelength where the wire is
significantly longer than one wavelength, then this wire stands the
high chance of turning into an end fire antenna. This means if that
wire goes up, so will the signal - straight up (with any number of
very minor lobes in all other directions).

73's
Richard Clark, KB7QHC