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So here is your system, it looks like you're going in a good direction, the SDS handles nx48 very well... JMC is on the right track. I have a question about your antenna. We've established that it's outside and it's high, is it a tri-band or dual band antenna? Just want to make sure it's not a 2 meter only ham antenna and what kind of coax are you using?
If you're that close, probably shouldn't make a difference. You should be able to just program this in your radio, as is, to its own favorites list and have no problem picking the system up if you say you're close.
There's a lot of talk groups as most casinos have but they probably only use a handful. Three out of the four security talk groups are encrypted and it looks like the main operations talk group is encrypted which makes sense in a casino... see doc's post for the list.
You should be getting five bars and a RSSI of -80 or better... you mentioned a noise level of 100 to 2500?
Always a chance of some kind of local interference due to your RF environment.