Ladys and gentlemen, we have BiQuad! Thanks to the incredibly fast shipping by Pete at BiquadAntenna.com (three business days!), almost all of the preliminary parts are in. Having goofed and ordered the wrong pigtail (RP-SMA), another order has been placed for the correct one (RP-TNC) to match onto a WRT54GL. A quick test with the antenna hooked to a D-Link AirPlus DWL-G520 wireless card (which uses the RP-SMA connector) showed a gain going through / around a couple of walls to a wireless router inside the house. So far, it looks promising!