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The flat bar is 3/4" x 48"

There are several lengths for the insulator as the antenna changed.

1st - 8" w/3" coil diameter

2nd - 6" w/6" coil diameter

3rd - 4" w/8" coil diameter 


Copper tubing changed, too.

The tubing lengths varied from 12" on the bottom to 17" on the bottom

and 12" on the top to 6" on the top. For the shaft the tubing is 1/2 inch copper pipe, not coil. To determine which length of coils and shafts you are interested in just compare the three different antennas and you'll deduce which lengths your to use.