Is there any external LTE antenna operating at Band 42 (3500MHz) available for the B612s-25d TDD-LTE router/modem?

Hello there!

This post enquires whether there is any external LTE antenna operating at Band 42 (3500MHz) available for the B612s-25d TDD-LTE router/modem. Please see more details below.

Source: https://www.ebay.co.uk/itm/Unlocked-WiFi-Router-Huawei-B612s-25d-4G-CAT6-CPE-300Mbps-Hotspot-B612-/202882500127

ISSUE DESCRIPTION

Firstly, I wanted to say I'm new here so I might have posted my question in the wrong section. Therefore in case this being true I kindly ask the Mods to move the thread to the proper section.

Recently I bought a new Huawei B612s-25d TDD-LTE router/modem which is introduced in this forum post.

This is a variant of Huawei B612 which is designed in a way to work with a rare LTE frequency band; Namely "Band 42" or "3500 MHz" band which is the only frequency range that ISPs in my country give their LTE-TDD service.

Also my signal strength is rather low, so I decided to buy some external cellular LTE antennae for it. But I searched almost everywhere on the web and I can only find Antennae made specifically for lower frequency bands (e.g. 600MHz - 2700MHz). Then I thought of no better place than official Huawei forums to ask about existence of such antennae and a possible place to buy them.

So I wanted to ask does anyone know about any external LTE antennae made specifically for Band 42 (3500MHz) to attach it to the device?

Thank you in advance!