Robert 11,

The Par Electronics End-Fed Shortwave Listener EF-SWL Antenna
will work in your Attic. And the Inverted "L" Antenna configuration
is generally a good choice to use with a the Par EF-SWL Antenna
for a "Low Noise SWL Antenna" using the 'design concepts' that
were popularized by John Doty.

Often enough I have written {Fingers On Automatic Typing}
CONSIDER BUILDING A "LOW NOISE" ANTENNA:
Try building an Improved SWL Random Wire Antenna that uses a
9:1 Matching Transformer (Balun / MLB) then you may not see
any real 'improvement' in your receive signal.
This is the so called "Low Noise" SWL Antenna.
Three "Must" Links to Read -wrt- Low Noise SWL Antenna
http://groups.yahoo.com/group/Shortw...na/message/949
[ Please READ These Three Links ]
http://www.anarc.org/naswa/badx/ante...e_antenna.html
http://www.anarc.org/naswa/badx/ante..._longwire.html
http://www.anarc.org/naswa/badx/antennas/grounding.html
ABOUT THE "LOW NOISE" ANTENNA 'DESIGN CONCEPTS':
A Random Wire Antenna Element coupled via a 9:1 Matching
Transformer at the Near-End of the Antenna with a Ground
Rod and Coax Cable Feed-in-Line to the Receiver. This is
the basic SWL Antenna that uses the "Low Noise Antenna"
'design concepts' that were {popularized} by John Doty.