[Milsurplus] LO radiation

[Hue Miller]

However, we are not talking about a diode mixer or a regen in the simple
detector + audio circuit.  The latter were quickly replaced near the start
of WW2. Also, i assume we are considering mainly  or only 500 kHz.
If that is true, the ship antenna was (probably? ) a short reactive antenna.
I am thinking, and i believe it can be shown, that the receiver match to the
antenna was not a good one in terms of favoring power transfer.
I am saying, between the RF stage and the unfavorable receiver match
to the antenna, there is not enuff signal to worry about past the radio 
room, or maybe the radio room in  a convoy vessel a few hundred yards
away.  
I would also guess that the actual radiation varied by frequency and 
was less at 500 kHz than at say, low HF.  
-Hue Miller