default or selected kernelversion does not have config value CONFIG_AR600x_DUAL_ANTENNA.
Result is shown for kernelversion 6.2.5
Dual Antenna
configname: CONFIG_AR600x_DUAL_ANTENNA
Front-End Antenna Configuration
└─>Dual Antenna
In linux kernel since version 2.6.37 (release Date: 2011-01-04)
Dual Antenna Design