I know it showed up on the homepage, but I hadn't announced it yet. I have launched a new feed for KSTL that includes all frequencies - Clearance, Metering, Ground Control, and Local (Tower) Control - in both VHF and UHF. The feed is hosted on a hill about 4 miles southwest of the airport, so I have pretty good reception on everything. There are some carriers (namely Cape Air) that operate out of an "alley" of the concourse that occasionally can't be heard at first, but once they start taxiing, you should be able to hear them.
If you listen and hear something clear followed by a response that is more static-y (or vice versa), it may be the scanner picking up the VHF feed followed by the response on the corresponding UHF frequency. I added the UHF frequencies to pick up military aircraft, including Boeing's fighter jets.