I had about the same results on my Optoelectronics Cub counter. There are
so many frequencies blurring around us all the time - the counter will not
usually lock in on a frequency unless it is significantly pronounced
compared to the other ones floating around. I can stand near a watertower
with several ham radio antennas on top but it won't lock them in if more
than one is in use at any given time. Not exactly what I expected, but I
still find uses for it...

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