BG2GVP Whether or not to add a network depends on the specific situation. If you don't add it, the standing wave will be very small. However, if you do add it, it may have an adverse effect.
My 770h has poor parking brake performance, and adding a ground net will help slightly. I trimmed a few centimeters, and with the ground net, the UV reading is still below 1.3. Adding the ground net brings it close to 2.