All the vertical part of the antenna is made of
aluminum tubing. B is a short peice of fatter
aluminum tubing than either A or C. C
electrically connects with A, so I presume
there is a coil within aluminium tube B. Tube
B, at the bottom, looks rivited to tube C.

So I'm saying B is like:

| | A
_____|__|_____
| | | |
|____|__|_____|
| | | |
| x |
| x |
| x | B
| x |
| x |
| x |
| x |
|____|__|_____|
| | |-----| Rivet
|____| |_____|
| | C
| |



There are insulated collarsat both ends of B.

X represents assumed coil connecting A to C.


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