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I too didn't like the cost of these active (amplifying) GPS antennas. I
found that an antenna from a Motorola Traxxar ground vehicle GPS system
works great  with my Garmin GPS 100AVD. I found it at  a ham radio swap
(Dayton Hamvention) for a mere $35. All my signal numbers increased about
40% and it locks in MUCH quicker. Besides, designing things at that
frequency really stinks  because many of the parts you will need are either
so small you can hardly see them or just not availible commercially.
Another option is try a sporting goods store. At 75 - 80$ they're still a
bargain compared to the $375 an aviation GPS antenna costs. I mounted mine
right under the glare shield with about a 12" length of coax on a 4 bid
L-bracket on the aft side of the header tank.

Good Luck !

Lloyd