Loop antenna for receiving 507.77 kHz.

It consists of 16 turns of #22 (or so) insulated wire on a square 20 inches 
to  a side.  Get 2 pieces of strapping 30"long and drill 2 holes 1/2" from 
the end. Put a peg in the holes (I used pieces of chop sticks) then bolt 
the 2 pieces of strapping together and wind the coil.  Connect a 365 pF 
variable across the  16 turn coil and add a single turn pick-up (the yellow 
wire in the picture).  Connect the ends of the yellow  wire to a piece of 
coax and plug the other end into your RX.  Try tuning the 365 pF variable for 
max signal  with a strong AM station 540 kHz for ex.  and then you can listen 
for VX9MRC by tuning it and pointing the loop in the right direction for max 
signal (the plane of the loop should point towards the transmitter). The loop 
may be rotated to null out a noise source that is in one direction. 

When tuning the capacitor, an insulated knob should be used.