Fred McKenzie wrote:

I do not know if there is an easy way to get to the antenna's ground
terminal, but had a related thought. Some of those old HTs worked with
a separate speaker-microphone that had an antenna mounted on it. You
may find a better antenna connection through the speaker-mike connector,
since it would be a co-axial connection there.

I have seen photographs of HT600's (Genesis series) radios where the center
wire of the coax was connected using an appropriately threaded brass bolt to
the antenna socket, and the ground (coax shield) provided by a smaller bolt
in the hole that holds the programing cable or other accessories in place.

Geoff.

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Geoffrey S. Mendelson, N3OWJ/4X1GM/KBUH7245/KBUW5379