Removes the SEPA categorical exemptions for microcells and personal wireless service antennas. A new categorical exemption is created for the collocation, removal, or replacement of transmission equipment that does not increase the height of the structure by more than 10 percent or 20 feet; or add a component to the structure that protrudes more than 20 feet, or more than the width of the structure at the level it is placed. Collocation is defined as the mounting or installation of equipment on an existing tower, building, or structure for the purpose of either transmitting or receiving, or both, radio frequency signals for communications purposes..