Signal strength vs throughput speed question

I am sharing internet with another household in my neighborhood and the
inconsistency in speed is frustrating me. I am using a PC with a
D-Link DWL-G520 wireless card installed. Initially when I set up the
network I attached a D-Link 6 dBi booster desktop unit which brought in
a connection that bounced between 6 Mbps and 11 Mbps and the
internet speed was fair but hardly consistent. Download speeds ranged
from 10-40 Kps. In an attempt to rectify I removed the 6 dBi booster
and installed a professional 12 dBi booster antenna (approx 4 ft long,
omni directional w/20 ft cable). This did in fact increase my
connection to the network to around 24 Mbps and higher. However, the
increased connection to the network did not increase my internet
throughput speeds as I had hoped (and in fact has dropped it
significantly). Leaving me to wonder what exactly is the relationship
between connection speed to the network and throughput speed? I
understand that internet traffic on my neighbors end will affect my
speed, but are there other factors at work here? Is there any settings
I can adjust on my end to improve things?
Your input is appreciated.


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