We were recently asked what LTE antenna is optimized for the Arris NVG558 Fixed Wireless Broadband Gateway. Those cellular connections marked “LTE 1 & 2” are type SMA-Female connectors. So, you’ll need a dual LTE antenna (2 connections) with type SMA-Male to mate with your router. We suggest using the RFMAX “brick” antenna # RBMM-55-SS-6. This model is dual LTE, with a magnetic mount and it supports 5G as well. You can attach it to something metallic, or simply put it on a desk or shelf. Note that this can be used indoors or outdoors.
If you have other technical questions, or if you have something else in mind, WE CAN HELP. With RFMAX, you have the ability to modify an existing antenna, or suggest a new design that is fit for your specific needs.
We have been informed in the comments that the Verizon version does NOT come with LTE ports.