28.8 till 56.6: Modem, sucks

Cable: I think from 64 till 2048. The problem is, is that you *share* the line with your neighboures. So when they start using internet, you're speed drops.
ADSL/SDSL: from 256 till 8mbit (and sometimes more, not really for *normal* use).
Cable rent (or whatever): With this, you can choose what speed you want. Only for big companies.
But maybe your dad can tell what he thinks broadband is...
Jochem