Reddit mentions of SMA Female to Y Type 2X L MCX Male Right Angle Spliter Combiner Cable Pigtail RG316

I've had success with this:
https://www.amazon.com/gp/product/B015ASUJ48
BNC connector on the cable that goes to the external antenna connects to this splitter, then the two other ends each plug into an SDR. (I have the "old"-style SDRs - the big blue ones that folks were using before the nanos became more popular...)

I have absolutely no complaints. I pickup a little 1090 traffic on the ground and start picking up 978 wx & rebroadcast traffic within 100 to 200 feet agl. I stash the stratux under my seat so it's out of the way - wired to ship power, and the mouse-style gps sits out of the way too near a window - don't have to do anything except fire up my tablet!

I just have one of these connected to the SDR's.

https://www.amazon.com/female-right-Spliter-Combiner-pigtail/dp/B015ASUJ48/

Then an SMA-BNC cable to the antenna. Stratux is attached to a window with a suction mount and is powered by a long USB cable to a lighter adaptor.

u/helno : any thoughts on how one might use the new UAT with an external antenna? I've used the dual MCX to single SMA splitter (https://www.amazon.com/gp/product/B015ASUJ48/) as suggested in a previous post. With the u.FL-to-SMA pigtail, have you come across a splitter with the different connectors?

Interesting. I'll give the laptop test a shot, that's a great idea that I hadn't considered.

I should have clarified - this isn't using any of the stock SDR parts aside from the SDRs themselves. The splitter is this guy.

On the off chance the Y pigtail is bad I also ordered a hardware T combiner for the two pigtails I got with /u/dmurray's antennas.