Any wire in which current is passing possess magnetic field and two magnetic fields repel or attract each other or deviate its path, so in Pakistan where our whole areas and streets are covered with wires and electricity pools, we can't get or achieve 90% of WiMax awesomeness. So forget that even 100% signal will do any good.
They do get 100% signals but not hundred percent speed with less latency which will be in case of absence of these hurdles for sure.
1 MBit/s connection you know can theoratically only give 128 kbps per download speed but people say that they are getting 140 kbps plus, do you know why because they put margin to compensate these losses.