I use my AXT1800 in my RV and would like to connect an external antenna for improved reception from campground wifi. I’ve seen on other models that there was a resistor to remove in addition to connecting an external antenna via wFL connection points. Please let me know instructions for connecting an external antenna. I take full responsibility for the reception aspects as a result of the external antenna.
In my humble opinion you better off with something like the GL-X3000 
Perhaps but I have a separate cellular router that doesn’t do WiFi-as-WAN so looking to use AXT1800 when reliable, and sufficiently fast WiFi is available.
Understandable, I have a AXT1800 and loved the way it it’s, I wouldn’t open it, but that just me,
You know, you still can skip the SIM part of the X3000 if you want too, that would give a backup LTE router just in case 
I know this is an old post but I was searching to do exactly the same. Wanted a router that would work with Starlink but also with campground wifi. I needed to move up from the old school CampPro R36AH Router and USB Adapter. The router is outdated and speed sucks. Wifi4 tech. It can only handle max 150 mb D/L but I never got even close to that. It really depends on the ISP at the campgrounds and many other variables. I use a directional RP-SMA antenna mounted to my RV for better signal and figured out what I needed to do. I also needed the replacement router as a repeater on my home internet when the RV is in the driveway which Im using that as my testing benchmark.
From what I can find in my research, the Slate didnt have wFL connection points on the mobo. But the Beryl did so thats what I went with. I dismantled the entire device tonight. Had it all apart and removed the motherboard. That was easy. Removing the fixed antennas was a little tedious but with patients and some muscle I got them off and perfectly fine that I can install them back to OEM with no issue. So the router is sitting on my workbench and just waiting for this kit to arrive tomorrow. Even better as I confirmed already, the original holes the oem antenna arms slid into and snapped in place are perfect size to slide through a male RP-SMA connector and screw to hold in place as well. No other case mods necessary.
Ill definitely have even better wifi reception using these 8 dbi gain antennas over the OEM ones and when I want to attach my external antenna I just unscrew one of these smaller 6 inch antennas and set the signal to strongest I can locate at any campground using Wifiman app.
Here is a photo of the Beryl just waiting for the new RP-SMA wiring and antennas to arrive. Will take me 10 minutes to finish up the job.
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That's a great update. Add far as hooking up a single external antenna, I wonder if all RF signals use both antennas. With MIMO technology, I was thinking it used different antennas for different flows. I'm no expert and hope someone will weigh in that knows.
As RV user I want to add, that the Spitz AX/Spitz Plus is also able to convert 9 to 36 V input. So the change is lower it will get fried with a solar panel or other power peaks.
But if you are using a steady power supply or reliable DC/DC converter, great job on switching the antenna with a SMA plug. I think plenty users want detachable antennas.
I am using the Shadow with external antenna as backup, as well 
Im pretty sure the design of GL-Inet boards on the wifi antennas wouldnt get negatively impacted for quality and degradation of the signal adding an external antenna because each one functions the same to offer a broader coverage map. Others have done this upgrade and havent reported of an issue. The GL.iNet GL-AR300M16 with already having external antennas folks have been successful installing just one external antenna while keeping the other on the standard one that comes with it.
I will however be able to confirm after I get my parts installed and test it. The board design, layout, and chipset seem to be exactly the same for both. Be nice if someone from GL-Inet can confirm this for the Beryl.
Change of plans. Im getting away from using my directional RP-SMA antenna and upgrading to a Wavlink AX3000 AP. Rather use POE and get away from added reception cables. This way the ethernet connection can be used on the smartplug of my RV for either Starlink or public wifi to my Beryl and Ill get much better performance with this setup. Still will keep modded antennas on the Beryl for better wifi signal reception to all my device's connecting inside my RV to the Beryl network. Not worth the headache of testing the original single external antenna RP-SMA connection to the Beryl.
