[Milsurplus] SCR-269 ADF on PB2Y-3 ??

[Hue Miller]

Just saw a photo of a "PB2Y-3 loaded with mail takes off from NAS, Honolulu,
1945".  ( Is this a "Mars" ? )  The top surface over the cockpit area has 3 of
those streamlined RDF footballs ( antennas ) in a row. I am wondering, why
3 ADF sets??

Also, the text: "A Navy patrol plane had just dropped a mail pouch to a 
submarine deep in enemy territory on a war patrol. The skipper of the 
sub sent this dispatch to HQ: 'Mail dropped without a hitch. Morale 
went up 100%, many thanks'. "

#1 I had never heard before about mail drops to subs in "enemy territory".
(maybe depends what you call "enemy territory".)
#2 I thought submarines, and actually all warships, were under radio silence,
only to transmit when absolutely necessary.

Your input?  Tnx,
Hue Miller