External Antennas for Netgear LB1120

[JoshuaB123]

Hey guys, first time posting here.

So I live in The Bahamas, and we're trying to fix our LTE situation and as far as I'm aware, this LTE Modem does support GSM Carriers, such as we have here, and currently our LTE modem that we have, which I won't name, is really struggling and we're going to upgrade our entire system starting with the modem. The problem is, where the server room is located in the house, its pretty much in a concrete box with a door which really hurts our current LTE modem as the signal can't pierce through so many 8" concrete walls and we're looking to incorporate 1 or 2 Omni-directional antennas on the side of the house parrallel with the cell tower (its only about 1,500ft away). So my question is, are there any suggestions for compatiable antennas that will work with this LTE Modem? And do I need to buy 2 antennas or will one work as I notice there is a "Main" and "Div" TS-9 Female connectors on the backside of the modem. I'm currently looking at this antenna (https://www.amazon.com/Proxicast-Omni-Directional-Outdoor-Fiberglass-Antenna/dp/B074YWTCB1/ref=sr_1_...) and I'm going to use a 50ft N-male to SMA-Male coax cable w/ a TS9 Adapter. Will this setup work, or should I use two 9/10db Directional Antennas instead? Such as this (https://www.amazon.com/TECHTOO-Directional-Cellphone-Amplifier-Signalbooster/dp/B00RYVLR4G/ref=sr_1_...)

Also, our service provider in the Bahamas is BTC, or BATELCO, which is supported by the modem according too Netgear's compatiablity list of carriers. Thanks guys. 

[getnear666]

If you are that close to the tower, you might just want to put the modem upstairs at the end of a long eithernet cable.

You can get a PoE kit and still power it from the basement...

If it were me, i'd get the PoE version of this modem (LB1121) OR get a PoE adapter kit to adapt the LB1120 to PoE, like this (https://www.amazon.com/BeElion-Passive-Injector-Splitter-Connector/dp/B01HMNJHII)

or this (https://www.amazon.com/ethernet-Splitter-Compliant-Surveillance-ipolex/dp/B078LYW6D7)
and get a weather proof box and put the modem on the outside wall near the roof.

And if you are still having signal issues, get two direction antennas and connect them stight to the Modem in a weather proof box. The longer the antenna cable, the more loss, but 300' of eithernet cable will not degrade the signal.