I a word NO.
In fact it can be very dangerous!
This is what Bill Whitlock writes:
Since soil has resistance just like any other conductor, earth ground connections are not at zero
volts, with respect to each other or any other mystical or ?absolute? reference point. Code allows
the resistance to earth (measured with special techniques) of a residential ground rod to be as
high as 25 S. It is far too high to trip the circuit breaker under fault conditions in the dangerous
hookup
of two ground rods (claimed to be a ?quieter? equipment ground). The soil resistance between
separate ground rods can also allow thousands of volts to develop between them if lightning strike
current should actually flow in one of them. This can seriously damage a computer modem, for
example, if it ?straddles? a computer (grounded via its power cord to the utility ground rod) and a
telephone line protected via a separate ground rod. [3] For this reason, other protective ground
connections (telephone, CATV, etc.) should be made to the same rod used for utility power, if at
all possible. If multiple ground rods are used, Code requires that they all must be bonded to the
main utility power grounding electrode. [4]
http://www.jensen-transformers.com/an/generic seminar.pdf