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*Close up of spring design
146MHz 1/4 wave 2.15dBi
446MHz 5/8 wave 3.8dBi
Overall Length 18 inches
Antenna just barely shows vswr below 2:1 across the 2M ham band, though the 2:1 bandwidth is over 5 MHz. The sweet spot was at 147.1 out of the package and I was able to adjust only down to 146.8. As I need 144.5 or higher, the 1.8:1 at that frequency was borderline acceptable. The VSWR on 70 cm was just fine between 439 and 450 and beyond, before and after my adjustment. All this is of course on my permanent NMO mount on the roof of a Honda Accord. YMMV. Performance as to signal quality both TX & RX is as expected / desired. The antenna appears to be quite adequately ruggedly made.