Una antena de base muy curiosa y con un sistema pendiente de patente.
MIDAS J-POLE ANTENNA KIT
http://www.amaratech.com/
TECHNICAL SPECIFICATIONS
Frequency: As 1/2λ J-pole from 26MHz to 30MHz
As 5/8λ J-pole from 30MHz to 1GHz
As monopole from 1.8MHz to 50MHz (depending on antenna