Topband: Phased active anntennas on 160m

[Paul and Abbi Elliott]

Does anybody have any design and/or construction information on a pair 
short vertical antennas without tophats or guys (but posibly with 
amplification at each antenna) for receiving on 160m?  I am looking for a 
system that will give me more directivity and less high angle response than 
the small loop I am using.  I hope to get a pair of antennas that can be 
easily moved around my yard (120 x 120 ft) to point in the direction of a 
desired DX station.  I do not do contests so taking 10 or 15 minutes to 
change directions is not too high a price to pay, in a noisy urban 
environment, for better reception of a rare DX station.

Any information and comments would be greatly appreciated.

Paul  W5DM  (in New Mexico)