Those great ranges are Line Of Sight without interfering signals. If you didn't setup the router per this forum's top post or sticky then any kid can be tapping your router even from blocks away and causing troubles.
1. 75 feet of what?
2. Try it with latest router firmware and this forum's settings.
3. Skip the N mode and try 802.11b/g mode for a test run.
I recently purchased the Belkin Wireless N+ router and adapter after I had read all of the great reviews and what great range they offered, but I was very disappointed. The range on my wireless G router and adapter was actually better. The box advertised a 1200ft range on the Belkin router and a speed of 300mbps. I'm 75ft away with a very low or poor connection(at 24mbps or less) and I'm constantly disconnecting while playing online games with the Belkin N+ products. With my wireless G I had an average connection with 36mbps. So my question is, Are there settings I can change to increase the performance of this router? If so what can I do to make the connection stronger, and if the Belkin router just plain sucks what's a good router to replace it with that can handle at least 54-100 mbps from 75ft away. Thanks.