Force MacBook Air 10.5.8 to connect to 802.11a

Hi,
Is there a way to force my MBA to connect to an 802.11a AP?
I am troubleshooting an MBA wireless connection problem. As such I would like to try & force it to connect via an 802.11a AP, since 802.11a is less susceptible to interference. While troubleshooting I have located & begun using “Airport Radar” and “AirGrab WiFi Radar”, which provide more useful information than the Airport icon.
Yesterday, my MBA connected to an AP which was about 100 feet away. And it connected to it via 802.11b/g. The connection was poor, in that it would periodically drop the connection. I turned off Airport & turned it back on. Then it connected to an AP located by myself, which was about 15 feet away. And, it connected via 802.11a. This stayed connected without problems for at least two hours. I verified this via my Cisco WCS "AP Association History".
Thanks for any help anyone may provide. While I have experience with Fedora & Windows, I'm still learning MBA.

Thank you for the reply.
I do not want to change the configuration of my Cisco Access Point to exclusively use 802.11.a. I have a mixed environment of Windows & MAC client laptops. I have a few MBA's that seem to have a problem with wireless connection. They have reported weak signal, slow response, etc. I've set up an MBA at my desk, & monitored its connection. I have monitored it using "Airport Radar" and "AirGrab WiFi Radar" on the MBA. And, I have monitored my MBA connection from the standpoint of my Cisco wireless network using Cisco's Wireless LAN Controller (WLC) and Cisco's Wireless Control System "WCS". It was from the perspective of my WCS that I discovered my MBA had connected via 2.4GHZ to an AP that is 100 feet from my desk. I turned off my Airport & cycled it back on. It then connected to an AP that is 15 feet from my desk at 5.0GHZ. This connection stayed up for at least two hours without any problem. I know that 2.4Ghz is more susceptible to interference than 5.0Ghz. So, I would like to try & force my MBA to connect at 5.0Ghz & perhaps to the specific AP located closest to my desk.
Thanks again for your suggestion.

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Force MacBook Air 10.5.8 to connect to 802.11a

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