External LTE antenna for Balance

I have a Balance 30 LTE and cellular signal is weak in the server room, but it works outside that room.

It is possible to connect an external antenna for LTE like this one:AMAKE 9DBI SMA Antenna 2.4GHz WiFi/GSM 3G /4G LTE Wide Band High Gain Omni Directional Wireless Signal Booster Amplifier Modem Adapter Network Long Range Antenna (SMA-J Cable Connector,3 Meters)

Amazon link: https://www.amazon.com/AMAKE-Directional-Wireless-Amplifier-Connector/dp/B01HR6FV94/ref=sr_1_1?ie=UTF8&qid=1501790971&sr=8-1&keywords=LTE+at+50+ohms+antenna

And if this is possible how long can the cable be, I am planning to mount this on the roof, that’s about 10 feet from the router.

If you have a better solution, my idea is to run a cable and mount an antenna there.

I highly recommend you consult with 3G Store - they have a great deal of experience with Peplink products and non-Peplink antennas/accessories.
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