I have a cisco AIR-LAP1262N-A-K9 and AIR-LAP1142N-A-K9, and i would like to join to Cisco WLC2106 (software version 7.0.98.0)
You can do that.
My ap 1262N have 3 antennas externals with 7dbi of ganancy,
Won't work. THe 1262 antenna can support only up to 6 dBi or less.
And the 1262 requires SIX (6) antennas.