I reviewed a GRE Super Amplifier in
April 2003 Monitoring Times. It is the smaller model,
designed for use with portable scanners.

The GRE Super Amplifier I tested (s/n 93156349) is
best suited for improving the performance of insensitive
scanners and test equipment when used with an inefficient antenna.
You may experience intermod if there are strong signals in your area.

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Bob Parnass, AJ9S GNU/Linux User http://parnass.com