How to guarantee to lower noise- ground loops in your system

Service ground is the copper rod driven into the ground, typically right beside the house and very near the meter.

Nope. The Service Ground is the Powerline transformer neutral. The copper rod is for lightning protection. Many homes do not have a copper rod. They rely on the foundation rebar mesh [Ufer: https://en.wikipedia.org/wiki/Ufer_ground] or tie to the cold water inlet. Multi family building are an entirely different kettle of fish.

The 3rd wire ties in the panel to the Mains transformer Neutral [Center Tap] - the wider terminal. It is the earth safety. NO current flows in the Lightning Earth Safety rod when a fault trips a breaker.

Have a look at the drawing http://ielogical.com/assets/M-125/PTPolarity.jpg . It shows how ground currents can flow from transformer induced currents and poor inter-stage grounding. The lower section shows operation with power transformers in phase and a Loop Breaker installed. See https://sound-au.com/earthing.htm#s9 on Rod Elliot’s "Earthing Your Hi-Fi - Tips, Tricks and Techniques." UNLESS YOU ARE TRAINED AND 200% KNOW WHAT YOU ARE DOING, DO NOT MODIFY YOUR EQUIPMENT. The life you safe may be your own!

"teaching the Tubes4HiFi / VTA M-125 to sing" was an exercise in getting rid of ground loop hum. http://ielogical.com/Audio/VTA_M-125.php/ The amps are 40db quieter than delivered.

Adding a copper rod can make a system unsafe as the potential between the copper rod and the original earth can create a battery and eat away the rod. Acidic soils eat away copper unless there is a sacrificial less noble anode.

Additional rods must be placed based on their length and the effective length of the existing earthing scheme. Placing a rod willy nilly may increase the impedance and reduce the effectiveness of the earth lightning safety connection.

@millercarbon: Please do not pontificate on things that may make a system lethal.

I have about 30 Leviton DSL06
Plus several Leviton TBL03
Plus one DSE06-10Z low voltage
All high-quality LED lighting. Some cheap LED lamps generate noise.

ZERO measured noise regardless of how many are on or in what position.

... you do not even need a ground wire between your electrical meter and the first electrical panel in the house.

In a single phase [home] Ground [0v] is the transformer neutral and is wired from the meter to the panel Neutral. The line is tied to the transformer case and earthed. The Line goes above and below 0v.

NEC 250:
Equipment grounding must comply with the National Electric Code (NEC) Article 250. All non-current-carrying metal enclosures for electrical equipment or wiring must be grounded. Equipment grounding means a continuous copper conductor connected between the grounding electrode (rod/grid) connection, at the source transformer, and at each enclosure and equipment frame. This is the most critical concept in equipment grounding.

Line and Neutral are carried through to additional panels. Additional panels require the Earth Safety carried through. The Earth Safety is not Ground [0v] although it may be at 0v potential

you can never have too many grounding rods for exterior equipment

Are these ground rods tied to the Earth Safety?

Driving ground rods willy nilly can reduce their effectiveness for intended purpose which is LIGHTNING!

Exterior equipment should use GFCI to reduce the risk from a person becoming a conductor!! An additional ground rod will do NOTHING!