Features and Geektails
Let's get the basics out of the way, then dive into the technical details. The WET11 is fairly small, having a footprint about an inch narrower than a stack of three CD jewel cases. The supplied single dipole antenna uses a reverse SMA (RP-SMA) connector and is jointed so that it can swivel 360 degrees and lock in 45 and 90 degree positions. You should be able to orient the antenna as desired, no matter how you position or mount the box.
The enclosure has no slots for mounting screws, though, and isn't really what I'd consider stackable, since the four LEDs (Power, Diag, LAN Link/Activity and WLAN Link/Activity) are on the top surface of the box. The single 10BaseT Ethernet connector, Normal / Crossover and Reset switches are all on the rear.
The WET is not set up for Power Over Ethernet (POE), so if you're thinking of using it for WISP (Wireless ISP) applications, you'll need to roll your own. There are plenty of ways that you can add POE, including ready-made products like the SMC Power Injector or D-Link DWL-P100 Power Over Ethernet (POE) Adapters, or if you don't mind a little cutting and soldering you can roll your own.