What is Reddit's opinion of U.FL/IPEX/IPX Mini PCI to Reverse Polarity SMA Pigtail Antenna WiFi Router Cable Antenna Mini PCI to RP SMA Coaxial Cable for WiFi Router Gateway Wireless Mini PCI Express PCIE Network Card Pack of 2?

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You don't. Those are extremely small wires that are nearly impossible to fix. It's cheaper and faster to replace the cables. This is likely what you need but you I can't guarantee they are the correct size: https://smile.amazon.com/U-FL-RP-SMA-Pigtail-Antenna-Cable/dp/B005UWD0EG I recommend looking at the measurements and trying to estimate the size of yours.

The other end of that black wire that is twisted up connects to the chip with a push connector. THEY ARE VERY FRAGILE. Use a small plastic spudger or guitar pick to pry them off very slowly so you don't rip the connection off the chip.

https://www.amazon.com/U-FL-RP-SMA-Pigtail-Antenna-Cable/dp/B005UWD0EG/ref=pd_sim_147_3?_encoding=UTF8&psc=1&refRID=MR82ED2TZTSAK1F47SQY

Or similar. If all you need is the cable just about anything will work. I have bought both the cheapest options and name brand cables fro a few builds like this and they all work about the same.

Yeah, you wouldn't want to place the antenna onto a metal panel. Typically in a laptop they place the antenna close to a plastic panel, behind the glass screen, or near an opening in the metal case. I think on an older macbook model they positioned the antenna right beside the DVDROM slot.

@ptrkhh Ideally I think you might want to drill a couple holes in the case and use something like this to externalize the antennas. http://www.amazon.com/U-FL-RP-SMA-Pigtail-Antenna-Cable/dp/B005UWD0EG

You'd need a new IO shield if you were to mount it there. Not really practical. You'll need these: http://www.amazon.com/U-FL-RP-SMA-Pigtail-Antenna-Cable/dp/B005UWD0EG

Then just drill a couple holes in your case and you'll be able to mount the rp-sma side to a panel on your case.

yeah it's totally missing, you only need one though, https://www.amazon.com/U-FL-RP-SMA-Pigtail-Antenna-Cable/dp/B005UWD0EG

connect it to the side that says Main on the chip and also get a wifi antenna

https://www.amazon.com/TECHTOO%C2%AE-Antenna-Connector-Wireless-Extender/dp/B00NVG5YZG/ref=sr_1_6?s=wireless&ie=UTF8&qid=1506421079&sr=1-6&keywords=wifi+antenna

I posted the Amazon links to give you a general idea of the parts that are missing.

You can get some RP-SMA to hirose pigtails on Amazon. There are several places in the black plastic top cover you can drill and install the pigtails to connect external antennae. Here's a photo of mine with the pigtails and a 5Ghz WiFi card installed: https://imgur.com/k2J9v4w I got these pigtails for the LTE card: https://www.amazon.com/gp/product/B005UWD0EG/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

You'll need to undo all the motherboard screws to lift it off the bottom plate to access the LTE card slot and connect the pigtails.

Once you get your pigtails installed the world's your oyster for antennae. I have a roof-top antenna on my pickup that gives me a very solid signal boost versus my cell phone in the cab.

I used this one on a hotspot I built last year. Again, what the other poster said, make sure the SMA connection is the same as what you have now (rp-sma in this case)

U.FL Mini PCI to Reverse Polarity SMA Pigtail Antenna WiFi Cable Pack of 2 https://www.amazon.com/dp/B005UWD0EG/ref=cm_sw_r_apan_glt_fabc_37858G4JW893HYNT937S?_encoding=UTF8&psc=1

thats just a whip on a ufl antenna connection, fine to fly with but can be upgraded (also make sure to use a dipole on your receiver when using a whip for best performance). you can get a pigtail adapter for the standard rp-sma https://www.amazon.com/U-FL-RP-SMA-Pigtail-Antenna-Cable/dp/B005UWD0EG but that would pretty heavy on such a small quad. There are some circularly polarized ufl antennas like this one https://www.banggood.com/50mm-5_8G-2_5dBi-to-3dBi-RHCP-IPX-UFL-Connector-Clover-FPV-VTX-Antenna-for-INNOVA-VTX-p-1173024.html?rmmds=myorder but thats one is pretty fragle and will be bent out of shape after several crashs. the axii ufl is smaller and more durable but is $20 for one which is a little too steep for my tastes so I got the lower quality clone https://www.banggood.com/Realacc-UXII-Stubby-LHCP-U_FLIPEX-IPX-5_8GHz-1_6dBi-Super-Mini-Antenna-For-TX-RX-Fatshark-Goggles-p-1262994.html?rmmds=search gets pretty much the same reception as a cloverleaf but is a lot more durable and looks nicer.

https://www.amazon.com/U-FL-RP-SMA-Pigtail-Antenna-Cable/dp/B005UWD0EG

Here's some pictures with text on how to add the antenna: http://imgur.com/a/dNChs

And here's a parts list:

https://www.amazon.com/gp/product/B005UWD0EG/ref=oh_aui_detailpage_o01_s01?ie=UTF8&psc=1

https://www.amazon.com/gp/product/B01GJ0TNUW/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1

https://www.amazon.com/gp/product/B00J14YEHQ/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1

Once you get the internal mod done, everything else is just plug and play.

https://www.amazon.com/dp/B005UWD0EG/

Under $5 for 2, with Amazon Prime.

You'll need two U.FL to RP-SMA cables, and RP-SMA wireless antennae. You can get them in a kit. You still need to find a way to mount the antennae.

Pretty sure you buy these or something similar for the antennas http://www.amazon.com/U-FL-RP-SMA-Pigtail-Antenna-Cable/dp/B005UWD0EG and then you need actual antennas to screw into it.

May also need a PCI bracket to attach them to.