Handi-Finder

1 - tune radio to fox
    channel
2 - extend antennas
3 - Connect Radio to HF
4 - turn on HF (red button)
5 - make sure you can hear
    the fox
6 - keep antennas pointing
    straight up and down
7 - turn HF to make tone
    completely go away
8 - adjust knob to change
    tone from HF
9 - fox is straight ahead
    OR STRAIGHT BEHIND you

works with any FM radio,
does not require attenuator
or calibration.  range is
fair.