[RKDinOKC]

First...
I have a base router in the middle of my house and wireless bridged or extended wifi routers in each of my bedrooms each at ends of the house. The computer I use sits right next to the wirelsss bridged wifi router in that room. I can turn off the room router and the wireless network speed of that computer drops to half. It is about 40 ft from the base and line of site. The wireless network is dual channel AC.

Other experiences..

Wired bridged wifi extension.
Set up my nephews new home. The new construction had all metal framing, it was like each room was a faraday cage. Used Apple Airport base stations at the time because they were easiest to setup and manage. Used a central base station with it's wired ports and wifi on the same network. The used other basestations wired to the central base station and their wifi extending the same wifi. With the wired connection to the base each access point was full bandwidth. Had the base and 3 remote hubs to cover his two story house. The base and one remote upstairs and two remotes downstairs. Basically one covering each of the 4 corners. Had to use wired wireless extenders because they could not reliably connect to the base.

Wireless bridged wifi extension.
My current house is not that big and my media center where the internet and wifi routers are is centrally located. When I first set up my wifi I could get 3 houses away no problem. Now there are so many with wifi in my neighborhood you can't go to one end or the other of the house without major signal loss and speed drops significantly, and my house is NOT that big!

My base was an Apple Time Capsule. Got a new Airport Extreme Base and two Airport Express's. Use the new Extreme for the base put the time capsule in a bedroom at one end of the house and an Airport express in each of the two bedrooms on the other end of the house. Set them up in wireless bridged mode. Now I have fast wireless all over the house again.

My main computer is right next to one of the bridged express routers. The express router is not wired. Can turn the router off and the computer's wireless speed drops to half. Same with the other two bedrooms.

More wireless extension.
A few years after I moved into my house my brother's father-in-law moved into a house right behind mine. A board member of the company we work for moved in next door to him, also directly behind my house. My brother moved into a house across the street from them. To save money we tried to have all four houses on the same wireless network and share the same internet connection.

The problem was the alley between my back yard and theirs has both underground cables and above ground cables. No matter what we did we could not get the network to pass the wireless wall it created. Where I work we have offices two blocks from each other that are connected wirelessly. Even the professional company that set that up was not able to get the signal to pass he wall. It's interesting a can walk around in my back yard and only see the networks on my side of the property line. Can go thru the gate to the back yards of the houses behind me and all the networks on my side disappear and I can only see the networks on that side of the property Line.

We ended up with two networks one for that side of the wall, and mine.

When I was working on setting up the big network thing I told the neighbors on either side of me what I was doing and that I could srt them up on the same network. That for the comparatively low one time cost of a wireless bridge router in each of there attics they would have fast wireless internet and no bill. They said no. Just don't understand people.