What is considered a bomb tower's "footprint"?

What is considered a bomb tower's "footprint"? - Grayscale Photo of Explosion on the Beach

In Bloons Monkey City, the 3rd rank (upgraded using Monkey Knowledge Packs) in for the bomb tower says that the "footprint is reduced 5%". What does that mean, and how does it affect my game?






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What is considered a bomb tower's "footprint"? - Inspirational Message on Blue Concrete Pavement
What is considered a bomb tower's "footprint"? - Grey Toy Cannon on a Beige Wooden Surface
What is considered a bomb tower's "footprint"? - Top View Photo of Person Standing on Beach





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