Best Routers with Antenna Socket: Improve 150mb/s Vectra Internet Connectivity & Range

I warmly welcome

I have been using the 150mb / s Internet for some time with Vectra, which works well ...
Well, in the vicinity of 2 meters from the router. Vectra's personal service technician decided that it was the fault of home devices and not the router. This way, when I close the door from my room to the room where the router is located, the download from 5mb / s drops to 700kb / s. I have read more than once that Vectra pushes junk routers, so I would like to buy a better one, the price does not matter. I just have trouble finding routers with antenna input. Will there be a good little soul willing to help? Thank you in advance!

TheFallenGod wrote:

finding routers with antenna input

Or maybe with a cable connector (cable modem)

The router with the modem from the provider must stay in place so that you have access to the Internet at all. You can possibly buy an additional wireless router with a WAN port or an access point called. AP if your Vectra device works as a router,