Both antenna are for indoor AP with RP-TNC connectors. So they should work on the 1262.
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Something additional to add, Cisco will only support antennas up to 7dBi on the 1260. Anything higher will cause the AP to be out of spec for FCC.
"Satisfaction does not come from knowing the solution, it comes from knowing why." - Rosalind Franklin
Here is my 2¢
Since these AP's have 6 ports, 3 on each radio, why not use an antenna like this:
Or if the ceiling isn't so high, something like this:
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