This is more of an informational post to provide what I have found when looking into the possibility of adding an external antenna on the Lite+ / nano/ nano+ series. After watching a couple of youtube videos I found a video from AlienTech describing how to modify the EVO Lite+ or Nano RC to add their tablet holder and antenna range extender. I was more interested in figuring out what kind of Rf connector is used on the Nano so I can convert to an SMA connector and attach passive antennas of my choosing.
I have linked to the video below at about 10 minutes into the video where the person states the connector is an "IPX" connector. An online search immediately found a number of IPX to SMA female jumper cables that are exactly what I was looking and available for about $3.00 USD and immediate shipping. The pictures of the IPX connector I found online look exactly like the connector on the Nano RC in the video.
To install the SMA connectors you would have to open up the Nano RC and access the 2 tiny IPX coax connectors and attach the new jumpers to get the SMA connectors. Then you would need to fabricate a mounting plate to attach the SMA bulkhead fittings.

PT113-09I-IPX-SSFBH: RFMAX Low Loss Mini 9 Inch Coax Jumper Cable with SMA Female to U.FL (IPX) (IPEX) Connectors
I have linked to the video below at about 10 minutes into the video where the person states the connector is an "IPX" connector. An online search immediately found a number of IPX to SMA female jumper cables that are exactly what I was looking and available for about $3.00 USD and immediate shipping. The pictures of the IPX connector I found online look exactly like the connector on the Nano RC in the video.
To install the SMA connectors you would have to open up the Nano RC and access the 2 tiny IPX coax connectors and attach the new jumpers to get the SMA connectors. Then you would need to fabricate a mounting plate to attach the SMA bulkhead fittings.

PT113-09I-IPX-SSFBH: RFMAX Low Loss Mini 9 Inch Coax Jumper Cable with SMA Female to U.FL (IPX) (IPEX) Connectors