We've used the T301 for a while with very few problems when we install them at beach accesses. I believe the range is 120 degrees horizontally and 30 degrees vertically...so of course we place them a bit back from the beach, but since it's typically line of sight it works great.
One of the owners of the company I work for had either an EnGenius outdoor ap, or a Ubiquiti outdoor ap (I forget), out on his back...I don't know what to call it, but it also worked fine and reached all the way out to the end of his really long dock. *snicker* But yeah, the T30xx has worked well for us.