we are looking for an LTE antenna specifically using NB-IoT or LTE-M that can be mounted on top of a metal enclosure within a box of the dimensions 130mm x 20mm x 50mm (WHD). The metal enclosure is a bit larger than the box given but only in depth and height. While we could attach an antenna inside a plastic case and maybe put some ferrite material underneath, you may already have a more competitive solution.
Unfortunately I have not found any suitable antenna for LTE Band 20, 8 and 3 in your offerings. Since we are in the evaluation/prototype stage we would gladly hear about any suitable product that you are currently in the process of bringing out into the market.
I hope you can help.