Cecil Moore wrote:

...
Radiation cancellation = destructive interference.

|destructive interference| = |constructive interference|

constructive interference = gain

Waves either add in force (hammering power), or subtract (hammers
against the "next hammer blow" coming) ...

What would be a "simplistic model" to convey what is in "your minds
eye?" And, hope the above few words projects the "correct picture."

Regards,
JS