Modems. i have broadband via cable. i have a wireless laptop. currently my modem is fixed in my

Question

i have broadband via cable. i have a wireless laptop. currently my modem is fixed in my bedroom which is where i can only use my laptop for internet access. i also have a desktop pc in the attic which is not connected to internt. my question is what type of router do i need to buy that will allow me use of both the laptop and my spare pc, without me having to move the modem!!!!!!!!!! please help