Yes, a wireless router (or a modem with that function integrated) comes with both an antenna for wireless and (usually 4) Ethernet-slots for wired connection up to 4 devices.
Be sure to use WPA2 security if you iPod supports it.
I have cable internet, and i'm planning on setting up a wifi network at home.
I only need it to use the net on my Ipod, so i've got a question, does a wireless modem connect to my pc through cable? or do i need to get a wireless nic to use the net on my pc after setting up the wifi?