Who I have the same questioned this topic

I recently signed up for the Verizon home lte service (not to be confused with 5g home lte). The router has support for an external antenna and there is a support page for it (see link below), as well as what seems to be a press image, but I can’t seem to find where to get it. Does anyone know if/when it will be available to purchase or if there are any other external antennas that are compatible with the Verizon home lte router? 

https://www.verizon.com/support/knowledge-base-232597/