homemade external/internal antenna for handheld.

In article ,
"RST Engineering" wrote:

You could have saved yourself half the price of the "commercially available
antenna base" by using a bulkhead BNC female connector, mounting it to the
same piece of aluminum and feeding one side with connector/coax to the radio
and the other side with a BNC connector on the other side with a brass
brazing rod of your choice in diameter for the radiating rod.

True, but this was a time-saving step.
(Red/white striped package, cannot remember the manufacturer. Larson?)
It was a HAM antenna base. Punch a 1" hole in the metal, unscrew the cap
from the base, insert base through hole, screw on cap. Whip set in a
well in the cap and secured with a set screw. The base had the coax
attached at a right-angle and fit the shallow area between the top and
bottom fairings.