Water infiltration by TV antenna crank during winter storage

It check my TT very often for any issue during storage since it's in my backyards. Last week (on christmas day), we got A LOT of RAIN in Quebec (very unusual for northern canada)... First snow fall around mid-november and so far I had about 2 feet of snow on my TT roof, so I decided to remove very carefully some snow before the heavy rain to prevent overweight damage (as I do the same on my shed's roof). Under the soft snow there's a good 3 inches of hard ice that cover the entire TT roof that I didn't remove (I can't). After a few hours of rain I decided to check inside the TT for any problem, then I found a high flow of water coming by the TV antenna crank, there's no water around the antenna mats mount. There's only a small amount of water on the floor because 90% of the water was absorbed by the top bunk mattress (which is a good thing is a way). I began by raising the front of the TT (it were levelled) to drain excess of water from the flat aluminium roof, then I was able to remove the ice on roof because it's mostly melted now. At this point the water stop flowing inside the TT by the crank so I left the front slightly raised and ran the electric heater for over 24 hours at 20'C to dry the TT interior completely. I bring the bunk mattress inside my house to dry it up completely.

When the rain stopped a little bit I took my 6 feet stepladder to check the antenna on the roof carefully but I can't find any crack or damage in the caulk where the water can goes in.

My questions is : how did the crank handle is water sealed from exterior and is there any possibility than the 3 inches of ice can make the water to goes over the water seal of the antenna mast or something like that?