Total posts : 45366
A reality check.
The Isotron is a base loaded vertical in disguise. The “vertical” part is not a whip or copper pipe, it’s a bunch of odd shaped plates of sheet metal. This serves to increase the capacitance of the vertical element, which slightly reduces the number of turns required in the loading coil (included in the antenna). The number of turns in the loading coil isn’t important practically from a performance standpoint. Radiation resistance may be reduced somewhat (a good thing) by these plates, but the reduction is swamped out completely by the typically high ground loss resistance of a practical part 15 ground setup.
I don’t want to disparage anybody who is honestly selling a good product, but this one doesn’t add up to the advertisements technically. Take a close look. If this is such a great product, why don’t you see at least one post from someone who reported increased range with all of the myriad of other variables kept constant.