WRT54G2 v1 - Substantial Speed Difference Between Wired and Wireless Connection

Hi everyone,
I have a WRT54G2 v.1 router connected to an RCN Cable Modem. My download transfer rate direct from the cable modem is 18 Mbps. Thankfully, I can get the same download rate when I plug my laptop into a wired ethernet connection from the router. However, the wireless connection only gets a download rate of 0.8Mbps. Also, my wireless card is pretty new (Intel 4965AGN) and has the latest driver (I can get far higher download rates at mobile hotspots, for instance). Here is what I've tried with the router:
 - I've upgraded the router firmware to the latest build (Version 1.0.04, 07/08/2009).
 - I've tried multiple channels on the network (1, 6, 11).
 - I use WPA Security.
 - Upon advice from the Linksys live chat support, I've changed the MTU settings to manual and set them to 1300.
 - They also recommended that I change the following settings: “RTS Threshold” – 2304 “Fragmentation Threshold” – 2304 “Beacon Interval” – 50
 -   And of course: I've got my own SSID. The router is 5 feet off the ground. There are no other wireless devices that would cause interference. The router is not near large metal objects, fish tanks, or any other physical obstruction.
Is there anything else I can do? Thank you so much in advance for reading. I really appreciate it.

Also, is there anything to the fact that only the download rate seems to change?
Wired:
Wireless:

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