Shortwave radio manufacturers offer little 23 ft wire antennas on a
reel. See, e.g.:
http://www.universal-radio.com/catalog/sw_ant/3184.html

If I put another 23 ft wire to the radio ground and run it off as
closely s possible to 180 degrees away from the first wire, will this
necessarily (likely?) improve reception?

Ken KC2JDY

Ken
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