I have verizon fios and I have 4 computers/laptops around the house. My fios router is located in the basement where i have a desktop hooked directly into. Going up to the main floor i have a laptop that usually gets no signal. Going farther up to the last floor i have a desktop which has absolutley no signal and a laptop which gets one or two bars on a good day. Is it something with them being on the same channel? (All of the wireless connections are on channel one)
if it is the channel, how can i change it

ps i have done speed tests on the laptop upstairs that gets 1 to 2 bars and the DL speed is 1.4mb and upload is about .8MB per second