Works with my strategy
My normal tactic for avoiding planes is yo-yoing. I'm on the surface 100% of the possible time cruising at 10 knots. When radar detects a plane I submerge so that I am at or below periscope depth before he enters a 5 mile diameter perimeter around my boat.
I stay at 100' for 5 minutes and come to radar depth. This isn't enough time for a previously unseen plane to enter my danger area. When I get the radar all-clear, I surface and continue as before. But if I knew how to extend that antenna from periscope depth, I could eliminate even the minimal exposure of the top of the conning tower while I get the all-clear.
Also if I had to stay down more than eight or ten minutes and lost a valid environment "picture" I could regain combat awareness with less exposure.
So how do you raise the SD antenna when at periscope depth?
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