MODIFICATION: Enables more sensitive receive above the 2 meter
  band.  (148 to about 162 MHz; after that, sensitivity drops off.)
  Keeps sensitivity for the FM broadcast band.

  1) Open the top of the radio by removing the 3 top screws and 2 side
  screws. Look at the radio with the front panel facing you.

  2) Note the silver rectangular box near the middle of the PCB marked
  something like "9 MHz SSB Filter".

  3) Move your eyes up from this filter toward the back of the radio.
  Follow the ribbon cable up.  Notice a wide white connector with
  several colored wires in it on the back of the PCB.

  4) The fourth wire from the left is a yellow wire.  Cut this wire.
  Rather than cutting it, you can remove the connector, stick a paper
  clip in the side of the connector under the wire, push it in, and
  pull the wire out.  Be careful not to remove the other yellow wire.

  5) Re-insert the connector back to its original place on the PCB.

  6) Open the bottom of the radio.  You will again need to remove 5
  screws.

  7) Look at the radio with the front panel facing you.  Note 5 tiny
  transistors behind the MENU button.  Follow the trace from the
  middle transistor to a hole just to the left of jack J8.

                           +------------------------+
                           |                        |      *
               [XX] [XX] [XX] [XX] [XX]             +-O   ***  J8
                                                           *
                           Solder wire into this hole ^

  8) Solder a small wire into this hole.  Be careful not to apply too
  much heat; use a low-wattage soldering iron.  Be careful not to
  damage the PCB or the grey cable coming out of J8.  Use a magnifying
  glass.

  9) Run the other end of the wire you just soldered to the front of
  the radio and attach it to the yellow wire you just cut.

  10) Re-assemble the radio.