Hi Friend,
Here is the method to identify and connect Ant-18 to AP104,
AP 104 has 4 connectors which are used for external antennas and out of 4 connectors; 2 for each band/radio.
Antenna connector mapping:
R0/A0: Radio 0 (5 GHz), chain 0
R0/A1: Radio 0 (5 GHz), chain 1
R1/A0: Radio 1 (2.4 GHz), chain 0
R1/A1: Radio 1 (2.4 GHz), chain 1
Comming to Ant-18 connections,
Hope got clarity on this,
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Please feel free to comeback for any further assistance on this.