Some details of the direction we are taking for our new coaxial collinear installs and retrofits when needed.
We like coaxial collinears because they are cheap, easy to build, can have lots of gain, and can be protected in a sturdy radome.
Our goal, whenever possible, is to avoid the need to insert extra amplification and power inserters in the system so we work to maximize gain from the antenna.
Current designs have 20+ elements enclosed in a 2.8 meter pvc radome constructed in 3 approximately equal segments lengths of 1 inch, 3/4 inch, and 1/2 inch pvc pipe. The 1 inch segment is reinforced with a 3/4 inch liner, the 3/4 with a 1/2 inch liner and the 1/2 inch with a 3/8 cpvc liner. The 1 inch base includes an extra 30 cm reinforced segment for mounting.
The cable used in this data set is Perfect Vision RG6 solid copper core.
Tests were run to compare various combinations of antenna, cable, and 2 different amplifiers
They were; 1: At the antenna (including complete data set), 2: Antenna + 50 ft RG6 cable, 3: Antenna + Paladin amplifier + 50 ft cable, 4: Antenna + PCT amplifier + 50 ft cable.