On 17 Jun 2006 21:43:40 -0700, wrote:

Thanks for your help Richard.
I think you're right about the tag antennas not being polarized, but I
know the big antenna mounted on the reader can be. These are the one's
I'm considering:
http://rfidusa.com/superstore/index.... 5d20420be597e

Hi Nathaniel,

Just build two dipole antennas and try one first. One may do the
trick. The circular polarized (or more likely cross-polarized)
antennas are mostly to anticipate a random orientation of the tag. If
you can put all the tags in the same orientation, you only need one
(the favored) polarization. Figuring out which is relatively trivial.
If you need circular/cross polarized, it isn't much more getting there
than cabling.

73's
Richard Clark, KB7QHC