We installed a Cambium 900Mhz 450i with the cambium dual slant sector on a tower. The sector is installed directly above a motorola/cambium 900Mhz integrated AP (so both antennas are 60degree) , pointing the same direction. We swapped out our first test customer today. The 450i AP is centered on 915Mhz 5Mhz channel.
Customer on 900Mhz Canopy
14dBi KPP Yagi
Receive power -78
Swapped out with a 450i CPE and Cambium dual slant yagi and -80 was the best we could do.
Swapped the Cambium yagi out for a linear ubiquiti yagi and we are getting received power at -76.5 and link test is 14.4Mbps down (95%) and 4Mbps up (100%).
We turned the transmit power on the CPE down to accommodate eirp limits and the 16dBi yagi and the AP sees the CPE at -80 but we still have 100% uplink because our 900Mhz noise floor here is around -85.
We will use the Cambium yagi's in most installs simply because in most situations 12dBi is enough and the yagi much ligher and we like the way the CPE / Yagi mount up. However it's good to know that the ubiquiti yagis not being dual slant doesn't seem to hurt much for those places where you need a few extra DB.
Edit: Well this may all be moot. As soon as I posted this I got an e-mail from KPP announcing they are going to make 14dBi and 17dBi dual slant Yagis for the 450i !