Download/install ' inssider' to look at your nearby radio waves to see
how many active AP' s are nearby and on what freq. Try different radios
in the client. What is the signal strength at the client?
With only 4AP' s I would not buy a POE switch, just purchase 4 POE
injectors. they are small power bricks to individually provide power
over the ethernet cable to the AP' s. You can plug them into whatever
vlan capable switch you have and provision c...