We keep stressing why it is vital to maintain bonding of all equipment anywhere near a grounding system or it's connectors - because no grounding method is low enough impedance to prevent lightning from creating transient voltage rises.
Lightning, which is a current pulse, contains a broad spectrum of frequencies-the center of the power spectrum is about 4.5 kHz, with the upper limit reaching into the MHz range. Its peak return-stroke current is extremely large (10's of thousands of amperes), typically lasting for a hundred microseconds, or so. As the return-stroke current pulse flows through the resistance of the earth it produces a very large transient potential gradient across the ground. This potentially lethal gradient-nominally 1,000 volts per meter-is known as step voltage (if you "step" across it, it will kill you). However, even when the current is flowing in a substantial metallic conductor (i.e., one having a very low value of dc resistance) very large transient voltages are developed along the conductor. Although resistance may be very low, e.g., less than 10 ohms, the inductance (L) of the conductor (nominally 1.5 micro henrys per meter of conductor length) times the very high rate of change (di/dt) of the current pulse produces transient voltages reaching 100's of thousands of volts, or higher (V = I*R + L* di/dt). Low dc-resistance to ground will certainly help entice lightning to join a ground system. Keeping lightning there is a more difficult task.
So, despite the big emphasis on achieving a very low resistance ground, the inductive effect predominates, resulting in transient voltages significantly higher than those attributed to dc resistance of the grounding system. A lightning grounding system must be capable of accommodating extremely high peak currents, and present low values of resistance and inductance (recall that we consider this total desired effect to be "low impedance").
When grounding system resistance is tested, the test equipment operates at a very low frequency. The result, which may look quite low, will actually be just the dc resistance component. Huge (i.e., deadly and damaging) transient voltages will still be developed across the conductor while return-stroke current is flowing on it.
Finally, consider a ten-meter section of heavy copper conductor connected to an earth ground at one end only. For lightning protection, two systems are bonded to it, one at each end of the section. The dc resistance between the two points is measured to be ten milliohms; the inductance is 15 micro henrys. A 50th percentile lightning return stroke of 24-25 kA, with a current rate-of rise of 40 kA/microsecond, flows through the conductor. Peak current times dc resistance produces approximately a paltry 240 V peak between the two "grounded" points. However, the peak transient voltage resulting from the conductor's inductance is 600,000 volts!
The two supposedly grounded systems are 600 kV apart, albeit only for a brief interval of time. Equipment damage and serious injury or death are definite possibilities, hence the reason for using single-point grounding and bonding of all near-field equipment. When long runs of conductor are required between station single point ground and AC service mains ground, antenna ground, etc., the only way to avoid deadly flash-overs and violent current equalization is to use many low-impedance grounding rods and multiple parallel paths with all equipment bonded together. This way, the system floats more or less equally, and is also capable of carrying brief periods of the inevitable high current associated with a direct lightning strike.
I hope readers here come to appreciate that neither component (grounding or bonding) can exist by themselves. Before the final page and conclusions, you may examine the schematics that represent my specific requirements at Oceana Radio. Your station will certainly have requirements unique to your individual conditions, but there will be commonality among all stations that use only a total system defense against lightning. Some stations actually prefer to toss feedlines out the window before a storm. In those cases, only mast grounding (external) and surge protection (internal) would be required. But let those operators sink a rod under the home for RF purposes, and....BANG....without bonding, they just drew a hundred thousand volts up from ground into a transmitter or tuner with lots of nearby metal objects. All of it will be destroyed, and a nearby person possibly electrocuted from a private fireworks display right inside their home.