i found a copy of ANSI/UL-452
Can't be adjustable gap.
DC resistance between antenna terminal(s) and ground has to be >=75k measured
at 6V
Current carrying components shall be corrosion resistant material. Ground
connection accommodates minimum of either 17AWG (for Rx) or 10AWG (for Tx)
Discharge test is 5 pulses of 500V discharged from a 2 microfarad cap. Then
check to meet the 75k requirement.
A bunch of rules about what the connectors need to look like, torquing, etc.
and what materials it can be made of, etc.
So, looks like you're not running 1 kW CW through a listed ADU if the impedance
is sufficiently high.
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