In message , RB
writes
Brings back scenes from old WWII movies where the Germans were closing in on
an Allied spy, with a suitcase radio set, sending from an upstairs flat, in
the dark of night. Vans crawling along with loop antennas on the roof, and
guys inside with comm gear and headphones telling the driver where to go,
etc.

Wonder if loop antennas were what they really used, and how good they were?

They were simple and with a good null. Only with arrays will you get a
better null.

The spies generally used cw. How do you get a fix on the short dots and
dashes?

Just swing the loop for minimum signal.

Mike