Wireless-G Router with weak signal

Hey. I just picked up a D-Link Wireless-G router and stuck it downstairs. I'm just up the stairs and around one corner, and it tells me I'm getting 18-24Mbps with "Low" connection strength.  And that's with the usb adaptor situated as close to the door as possible.  What's the deal? My old linksys had a much stronger signal until it fried. It was 802.11b, but that shouldn't make a difference at a distance of maybe 15m.

>>8
And you forgot the main reason: you can compile them with -Wall -s -O3 -funroll-loops -malign-double -ftemplate-depth-30 -ffast-math -march=<hw> -mtune=<hw> -fstrict-aliasing -fomit-frame-pointer -malign-jumps=4 -malign-functions=4 -malign-loops=4 -fschedule-insns2 -mwide-multiply -fprefetch-loop -arrays