Be more specific. Which ones?
Generally speaking the ones that would be most useful with a portable would be ones where the gain could be reduced. Actives usually work better - if at all, in some instances - with desktop or computer controlled receivers, not portables. Actives sometimes just have too much gain for a portable to handle without serious overloading issues.
There are active loop antennas; some of these are quite useful for portables, but are generally very expensive. If you're interested in that side, check the loops wiki page for some online reviews.
Don't be afraid to get out a soldering iron and build something. If it doesn't work, the only thing you're likely to damage is your wallet. 73s Mike