Haha on the contrary, almost every single alley (between two concourses) at LAX has its own airline operations-run Ramp frequency! I've seen several copies of the Jepp 10-9B page from different carriers with their ramp freqs, but wasn't able to find any on google. I was able to find this
related document on the topic which includes the frequencies below:
Alaska Ramp Tower (Taxilane D-10) 130.85
American Ramp Tower (Taxilane C-10) 129.32
Delta Ramp Tower (Taxilanes C-8 and C-9) 131.45
United Ramp Tower (Taxilane C-7) 129.40
United Ramp Tower (Taxilane C-6) 129.50
The one time I've flown into LAX I had a few hours to kill before my connecting flight, and I got a chance to sit in one of the restaurants looking out on the C-6 alley and listen to ramp control. In the following aerial photo you can see that the C-6 alley is actually split into two parallel center lines, one orange and one blue, ending with the large painted arrows at the hold short line to taxiway Charlie.
Every UAL/SKW flight in that alley would call ramp control on 129.5 to request push back and engine start. After the push back, the ramp controller would actually instruct the airplanes to taxi from their positions in the alley, up either the "orange line" or the "blue line" to one of the arrows holding short of taxiway charlie and then contact ground for taxi from there. Similarly, inbound arrivals would call ramp on their second radio prior to being outside the alley and get both their assigned gate and instructions to get there. For instance, I recall instructions going something like this: "Skywest 100 follow the orange line in to gate 80, use caution for the outbound 737 on the blue line."Here's a Bird's Eye view of the entrance to the C-6 alley
Considering its an airline operated position and not FAA air traffic control (since ramps are non-movement areas), communications on Ramp Tower and airline Operations frequencies can still be very interesting listening, and give the listener a new perspective on the bigger picture of how traffic flows at that airport.
I've certainly always appreciated feeds with these extra frequencies included.