high frequency intermittent noise

I have a noise issue that is intermittent. Here is what the noise sounds like:

https://clyp.it/4b233bmm

Here is what I know so far:

The sound affects all components and is compounded if all components are turned on. I have turned off my preamp, phono preamp, leaving just my mono blocks on, and the noise still appears.
I have turned off everything and unplugged everything in the house including my dimmer switch, and the noise still appears.
I have a pair of pro-audio monitors, self powered with class AB amps, and when I plug those into the same outlet, I hear the same noise coming through the pro-audio monitor. So this rules out my big system.
The noise is primarily during the day and goes into the evenings, weekends too, early mornings it does not appear.
I live in a pre-war mid-rise building. I have no ground, I'm using a Nordost QKore grounding system. This did reduce the noise floor quite a bit, but has no affect on this intermittent noise.
I have a cell phone tower directly across the street from my building in Manhattan.
Looking at a real time analyzer, I see peak at 2kHz when the noise appears.

james196911-12-2017 2:30am

Post removed Nov 17, 2017
james1969 OP Details Discussions Posts This discussion Message User 347 posts 11-17-2017 at 04:31pm Copy Comment URL Report Comment Edit Delete I don't, I will go and get some...
Post removed Nov 17, 2017
james1969 OP Details Discussions Posts This discussion Message User 347 posts 11-17-2017 at 05:15pm Copy Comment URL Report Comment Edit Delete I just got off the phone with Rob at Furman. He’s a great guy, been in the pro-audio business for 24 years, 16 at Furman. He says he’s seen music studio’s go through the same issue, all of a sudden an antenna gets put up and there’s nothing to do except move. I cannot move, so then he said the next approach is to build a faraday cage and opt for better shielded cables. This is an air borne issue, the cell tower is coupled to the air, Rob was amazed. I sent him the 2 sound samples I posted here so he could hear.
james1969 OP Details Discussions Posts This discussion Message User 347 posts 11-17-2017 at 05:48pm Copy Comment URL Report Comment Edit Delete Well...on the positive side, I've eliminated a ground loop, and have reduced the noise floor in the music quite a bit. The Nordost QKore took care of my ground loop issue, and the Furman P-2400 IT reduced my noise floor. Does anyone have any experience with AudioQuest cables? They appear to have an active shield that is battery powered... Thank you EVERYONE who participated. I'm a little tired...but I will get some tin foil now...