I understand that the NEC requires that all grounds (e.g., lightning
protection grounds and grounds for radio transmitting equipment) must be
bonded to each other and to the utility company's ground. The books I
have read say this is accomplished by connecting everything to the
ground "at the service entrance panel." But how is this to be
accomplished? By clamping the ground conductors to the conduit (after
cleaning it down to bare metal) that comes out of the ground and up to
the meter on the wall of the building? By bringing the ground conductors
through the wall of the building and into the panel and there connecting
them to the existing ground bus? Or . . . ?

MB