Provisioning incorrect antenna gain values can lead to violation of regulatory rules, which can have serious consequences.
HPE Aruba relies on "professional installation" to transfer responsibility for certain aspects of legal operation of the wireless network to the customer/installer.
Since regulatory limits are typically expressed in EIRP power levels, our software adjusts for that when enforcing those limits. Entering a low antenna gain number can result in exceeding the regulatory limits,
The antenna gain numbers should include anything between the antenna connector and the air. For all Aruba antennas, the numbers we specify in the antenna datasheets includes all that (including connector and cabling loss). If the cable is extended, the resulting additional loss should be used to offset the gain number.