extending range of wireless net

[AZ Woody <reply@here>]

I got a Linksys wireless router-G

Anyway, it's usable in the house, but a bit weak in parts of the back yard.

I've moved it to a "high point" in the house (a plant shelf about 9' off
the floor), and that helped a bit.

I was wondering if anyone knew of a way to replace the antennas (there
are two) on the router to help with the range, as the plant shelf is
only a short term (and partial) fix.