Neighbors have organized opposition and petitions to the stop the tower, saying it would devalue their residential property, detract from the character of the village and should be located at a different site.
Several have said they get cell phone service and the tower is unnecessary.
Firefighters say the tower is needed to enhance emergency communications.
In a statement Wednesday, Fire Department Capt. Karl Fuchs said, "Although there is a monetary benefit associated with leasing property to Verizon, the main reason the Gaylordsville Fire Department has decided to support the construction of this tower is enhanced cellular and radio communications for emergency services in the town of New Milford.
"The monumental growth that New Milford has seen during the past decade, especially in the last five years, has created cellular and radio communication challenges for all emergency services departments."
Fuchs said emergency radio antennas to be placed on top of the 120-foot tower will allow enhanced cellular and radio coverage throughout New Milford.
On Tuesday there will be a site walk at 3 p.m., and Verizon will fly a balloon during the field review to simulate the height of the proposed facility. A hearing begins at 4 p.m., and continues at 7 p.m., in the cafeteria of New Milford High School, 388 Danbury Road.
The 4 p.m. session is for the applicant, parties and intervenors, but it is open to the public. The New Milford Zoning Commission has filed as an intervenor. The 7 p.m. session is reserved for the public to make brief statements into the record.
Residents are setting up "Stop the Cell Tower" signs on South Kent Road and other parts of the village.
Michael Covert said in a letter to the Siting Council that the tower will be 178 feet from his house.
"This cell tower will jeopardize the integrity of the landscape in this historical river valley, which should be preserved, not defaced with a 120-foot cell tower in the middle of town," Covert wrote.
He and others argue there are several more suitable locations for the tower, away from homes.
Should the tower be approved, Covert said he intends to file lawsuits against all parties involved to recoup the lost value of his home.
Cellco Partnership, doing business as Verizon Wireless, contends public need for the 120-foot tower outweighs any adverse environmental effects that might result from building and operating the facility.
More than 100 people have signed petitions opposing the tower.
Zoning Commission members have recommended against the tower, questioning whether it is the best option for improving cell service in the area. The panel has recommended exploring the use of CL&P towers in the vicinity as an alternative.
Residents may file written statements with the council at the hearing or up to 30 days thereafter at the office of the Connecticut Siting Council, 10 Franklin Square, New Britain, CT 06051.
A copy of the application is available for review at the Council's office during office hours. For more information call the council at (860) 827-2935.