TV Tuner card for Ubuntu 9.04 amd64

[aviper4u]

Hi,

Want to use a TV Tuner card with Ubuntu, apparently this is no problem
with MythTV though on the following page

http://www.linuxtv.org/wiki/index.php/Supported_Hardware

The guide talks about plugging in the card then running commands to
see if it compatible?

I want to know if it compatible before i purchase it :)  Is there any
other avenues i can pursue?

Thanks