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if i have an AP350 without fixed antenna.
can i use the antenna provided by PCI wireless cards? has it the same power?
generally, if we use 2 antenna is it better than using one ?
The PCI card should have an antenna with an RP-TNC connector, which will work on a Cisco (or LinkSys) AP or Bridge.
The instances where you truly *need* a second antenna are rare.
If you are scrounging for cheap parts, third-party antennas with RP-TNC connectors are readily available.
Chief Wireless Architect