that's such a specialized niche market. you're not likely to find something for that specific task, but if you're feeling brave, you could get a project enclosure from radio shack and use some standoffs or something to mount it. but then how to go from your board to the tuner card, i dunno. has anyone ever seen a pci extention cable (or something similar)?
why do you need to get it out of your 'puter anyway? maybe i'm not quite understanding what you're looking for...
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cid