Another VHF Trunking Mystery?

A few months ago some reports from the east coast indicated that there was an EDACS trunking system operating in the VHF federal band somewhere nearby. It was determined that it was a two-site analog EDACS system belonging to the NASA facility at Wallops Island, VA.

Now a report has appeared in one of the Radio Reference forums that a similar VHF EDACS system is being heard in the Houston, TX area, but the poster believes that this system is being heard via skip or ducting and is not local.

http://www.radioreference.com/forums/showthread.php?t=88827

The frequencies reported heard are 163.5625 MHz, 164.5000 MHz and 165.0875 MHz. These frequencies are often associated with military facilities and the US Army Corps of Engineers, so my first guess would be a military base in Texas or Louisiana.

Anyone else hearing these frequencies active?