Do I need to buy an ethernet switch that has a WAN port

I want to buy an Aiport Express to handle a WiFi only iPad and an old PPC iMac with 10.5.8 on it that has no WiFi card. The iMac gets on the internet from a cable plugged directly into its ethernet port (using DHCP). The cable comes off an antenna at the front of the cottage. A signal hits the antenna from a broadcasting tower about half a mile away.
I need to buy an ethernet switch for the Aiport Express to handle both the iPad wirelessly and the wired iMac. Does the switch have to have a WAN port or can I buy one with five LAN ports?
Message was edited by: Roy Vincent. Spelling error

So here's what I am planning to do. I get myself an ethernet switch. I plug my cable from my antenna into it. I run a cable from one of its five ports into my iMac. I run a cable from one of its other ports into my Airport Express. I configure the Airport Express in Bridge Mode. Now my wife can connect to the web wirelessly using the iPad and I can connect using the wired iMac --- and we can do so at the same time and indpendently of one another. No?
Sorry, but no.
You only have one IP address. With a switch feeding two devices, it will be a matter of chance as to which device gets the IP address.
The other device will not be able to connect to the Internet, since a switch cannot "split" the connection.
Instead, you need a simple wired router to "share" the public IP address that you receive. In turn, the router distributes "private" IP addresses to devices on your local network, so each device will be able to connect to the Internet.
As I mentioned, a switch cannot perform the functions of a router.

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