Out of range...How do I know for sure?

Question

Installed WRT150N wireless router between DSL modem and computer. No problem doing so using setup CD that came with the router. Solid intenet connection. (Wired)
Installed WMP300N wireless card in comp 100 feet away in another frame building. Also used setup CD that came with the card. Card seems to have installed ok. Also used Easy Link Advisor and Wireless Network Monitor - But Monitor Link Info Tab - has message...
"Cannot Associate with the Access Point."
Signal Strength box is blank
Link Quality box is blank
On Profiles Tab -
Profile and wireless network name fields are blank ( Empty)
"Scan" or "Connect" works but produces nothing.
Monitor states adapter is Active; green light on back of card is blinking. (Scanning)
It's like there is no wireless signal anywhere close!?
I don't know what's going on. I used the main wired comp to "try and Add" the computer to the network but that didn't work either.
I can't find a thing wrong and have spent hours reading FAQ's. Woof, no joy.
It looks to me like the comp/wireless card is just too far away from the wireless router to pick up a signal from it or a firefly has more power in his little butt!? Beats me but it's "wireless N" technology ( touting ideal conditions of 1400 feet line of sight ) and its totally out of range at 100 feet ... between two frame buildings?
Any ideas? I would like some sort of prize offered to the person that has actually connected with the most distance between them/their comp and the wireless router.  I know 100 feet is no joy. Anybody have a connection at 95 feet? Raise your hand! I'd like to know..I bet a lot of us would! 
(Hey linksys, what I gotta do...Load the comp in a wagon towing an extension cord to see how close I can get to the router before the card finds a signal and connects? (Now theres an idea! Makes me wish I had a lappy.) The up side is the security...one might be able to park over this router and not get a connection. Hahaha
( Don't jump on me...respect your elders..I'm 60 with a tricky ticker! Not doing my blood pressure any good...)
Ain't this supposed to be an excellent brand...You don't like "ain't", Ok...arsn't this supposed to be an excellent brand of equipment?
Does this sound like out of range to you? Anyone?
Thanks,
Thu

Answer 1

On router change radio band to standard, and standard channel to 11. Change advanced wireless settings : change beacon interval to 50, fragmentation threshold to 2306, RTS threshold to 2307, DTIM to 2. On computer instead of using linksys WLAN monitor, switch to windows XP's client WZC. It might connect after that.