The Washington Examiner has some higher-res images available (download the pic and zoom in)
Motorola CM200 pair (presumably using a RICK)
Also an Icom rack-mount something or other (sorry, I don't do Icom)
As far as RF conditioning, I'm seeing:
Simple fiberglass sticks with radials (such as a Comet GP-3)
A couple Stationmasters
The subscribers they show include two Kenwood business-class radios, a Moto HT1250 and MTS2000, and the FRS crap. Antennas appear to be UHF.
However, the duplexers are all sized to be VHF. If they're UHF, they're designed for some seriously high power output.
I'm thinking simple analog repeaters (the XPR is an oddball, but maybe they're just using it in analog mode) and analog links, like many wide-area amateur repeater systems. These systems would be relatively easy to set up, and would provide what they'd want with a minimum of fuss. Delivering traffic to some radios while bypassing others could be accomplished using MDC, FleetSync, etc.
Considering the geographic area, I'd also not be surprised if we're looking at pieces from multiple systems. They may have basic UHF conventional stuff in places, MOTOTRBO in others.
As far as OpenSky - as powerful as they are, I don't think the Zetas have whats necessary to successfully deploy OpenSky (don't tase... err, slaughter my family... bro!) - that technology hasn't been invented yet!