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This question was posted before with no answer.

When Multipath occurs due signals being reflected and they come in phase the signal increases its strength and when they arrive out of phase the signal decreases its strength , is that it ?

Because i read that if they were 0 to 120 degrees out of phase they would increase its signal ( upfade ), between 121 and 179 they would decrease ( downfade )and 180 they would null each other.

Are these different things ? A signal will only increase strength if it is in phase with main signal or could there be an increase when it is out of phase ?

what you've read is correct, the waves don't have to be completely in phase to cause upfading.