The Comet GP-24 antenna has a 0 degrees electrical downtilt
The Comet GP-24-3 antenna has a 3 degrees electrical downtilt
Product Description

The GP-24 antenna has a 0 degrees electrical downtilt. The GP-24-3 antenna has a 3 degrees electrical downtilt. It is an extremely high gain, heavy duty antenna designed for maximum distance and signal strength where client locations are below the antenna or the same height as the antenna.
The antenna mounting pipe is uniquely designed to protect the coax to antenna connection from wind/ice/snow. Thick wall fiberglass radome and two extruded aluminum brackets with heavy duty stainless steel hardware secures the antenna firmly in place
Specifications:
2400-2500MHz omnidirectional base antenna
with or without 3 degree downtilt
Gain: 12dBi
VSWR: 1.5:1 or less
Max Power: 100 watts
Length: 5 feet 10 inches.
Weight: 2 lb 9 oz
Connector: Integral N-Type