Hi,
Sorry for the late response..
yes it is of no problem to conenct AIR-ANT2506 2.4Ghz bridge antenna on the AIR-LAP1242-E/AK9.. I guess we can find around 3 kinds od antennas for 1242.. all of them can be used as well!!
lemme know if this answered your question..
Regards
Surendra
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Regards
Surendra BG