Are any of you guys familiar with a "Viper" antenna? It came up in a recent discussion with club members for higher frequency bands (6m, 4m, 2m). I hadn't heard of it before and internet searches suggest it's a brand as opposed to a type.
However, it seems the one thing they have in common is the coil (large or small) somewhere along the shaft. So, how do these antennas work electrically and do they have advantages over better known antenna types - or are they just snake oil (sorry, just couldn't resist!!)