AOWireless

It all depends on what your application is and throughput required (my disclaimer). Unlicensed radios take advantage of OFDM and MIMO (basically making multipath an advantage (see my blog on the topic and be sure to Digg it: "Non Line of Sight Point to Point Wireless Backhaul" - Non Line of Sight Point to Point Wireless Backhaul). The disadvantage is the risk of interference. The systems are cheap in costs because of the 802.11n chipsets they use. They work well and we deploy them for clients all the time. They work well for video backhaul. With nLOS you will end up with a lower modulation and lower throughput. I typically do not recommend them for an organizations primary backhaul. If you have LOS I always recommend licensed radios that do true full duplex and are immune to interference. The unlicensed radios use TDD and the throughput is aggregate. They also have a larger packet header due to the 802.11x standard. If you need a simple bridge they are great. If you need carrier grade connectivity go licensed.

Ubiquiti uses the same Atheros based 802.11n chipsets as most all the other point to multipoint manufactures. There is a lot of outdoor wireless bridge equipment in the same class (e.g. Proxim MP8100 series). They have taken advantage of the 802.11n standard and using OFDM and MIMO. The one thing about Ubiquiti is they use some proprietary parts (like cables and antennas).

What wireless devices where you using? Are you using two 802.11n AP's or a true wireless bridge?