Wireless Internet Signal from "Host Computer"

I know that in most wireless networks, the router picks up the internet
signal directly from the modem, and broadcasts that through the air for
computer signals to pick up.

However, my DSL modem is from the stone ages, and doesn't have an
ethernet port on it to connect to a router. It connects to a computer
directly by USB.

So, the question is: Can I broadcast a wireless signal by connecting a
router to a sort of "host computer" with an internet connection, rather
than directly to the modem?


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