[SI-LIST] bypass caps on unused pcb area

Is it a good idea to sprinkle bypass on areas of a pcb that are otherwised
not used except for power / ground planes?
The idea being to keep the power / ground planes from creating a resonance
and radiating.
Could such a resonace be exicted if there are no traces or components
nearby?
If so, how do we determine the interval of placement. We have no simulation
tools to help us.
 

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