Thanks to a post elsewhere, I found the 2.4GHz 19dBi RooTennaTM Compartment
Antenna with CB3 Client Bridge Option at:

http://www.wlanparts.com/product/ZZ-CB3-RT24-18

for about $177 each. This looks like it would fit my situation very well
as a pair can be configured for a point-to-point bridge link (they claim
one is in operation covering a five mile link and I have just over 1.5
miles to cover).

- Nate >>

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"The optimist proclaims that we live in the best of all possible worlds,
the pessimist fears this is true."