The Author has been building yagi and omni antennas for decades. For this project it was decided to try some of the commercially made ones. This evaluation is for one of the Tram antennas. Ordering was made from Amazon which arrived in the mail about a week or so. The contents were ok. There were little or no instructions, only a cutting chart. They could have done better.
The model of this Tram antenna is 1181 being a mobile dual-band antenna with a NMO mount. Both bands appear to be satisfactory, however, the Author would like a better RL for the VHF band. The other observation is the resonance for UHF is a little above the amateur band. At the amateur area for return loss is about 16 and 20 db on VHF and UHF, respectively. It appears to be well constructed.
Shown here is a test bench (on wheels) with the sweeper, return loss bridge, some (high performance) jumper cables and a "mini" tri-pot for taking the pictures of the sweeps.
This may be copied in complete form only for non-profit purposes, such as for the knowledge for the amateur radio service, with the Author credited as designer. For other arrangements please contact the Author.
Copy write: AK2O 2017