Check out this thread, it talks about GPS-Sync using omni antennas and how to set the front/back setting. Below is a chunk of our network with channels and Front/Back setting. We stick with 5.8ghz because of the power limitations of 5.3-5.6ghz in the USA. If you have the ability to use these channels then GPS-Sync could be less important. Even if you don't think you'll use GPS I'd highly recommend buying the GPS radio. It gives you; a gigabit ethernet port, 802.3af POE, and the option to use GPS if you change your mind later.
3 Likes