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Mechanical tilt is given physically but Electrical tilt set by antenna designer for the operater....

If mechanical tilt given the front lobe is directed to the particular location..means toward the H- plane...and back lobe is directed to air..means opposite direction to H- plane...so occur result is the interference in back lobe...

If electrical tilt given the front lobe and back lobe toward the H-plane.....so occur result is reduce the interfernce in back lobe...

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