802.11a outdoor antenna

Hello,
I have to cover an outdoor area with wireless (802.11b/g). Due to the lack of wired infrastructure I thought of building a backbone using 802.11a.
In my area (ETSI) there are only specific 802.11a frequencies allowed for outdoor use (5470-5725).
How do I configure an AP1242AG to use only this frequencies?
What would be the best antenna to build the 802.11a backbone (there is nothing suitable in the cisco portfolio)
regards
HMK

Diversity is generally only needed in situations where you encounted multi-path interference, so if you have lots of metal in the area (for example) then it might be worth a go. If you go with diversity, I THINK you're supposed to keep the antennae about a wavelength apart, so ~12.5cm.
For the 5GHz links, try to keep the TX and RX antennae the same gain, although it's likely you'll need an omni-directional for your Root Bridge, and directional antennae for your None-Root Bridges. If you have different gains at the root / none-root, you can encounter problems with transmit power mis-matches - one AP can hear the other, but not vice versa.
The 1400 comes with a built-in directional antennae, or with connectors for adding external antennae. Most importantly though, it is rated for outdoor use, where as the 1240 is an indoor AP, which will therefore need cables running between the AP & Antenna.
2.4GHz antennae is entierly dependant upon AP positioning, coverage requirements, etc. 2506 is probably a good place to start if you're not very experienced with spec'ing antennae.
Regards,
Richard.

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