C3 Electronics LLC 49:1 UnUns are constructed with a solid, high-performance toroid and materials to provide the impedance transformation needed for EFHW.  Built solid with a counterpoise connection which helps to improve your antenna's performance and ground connection.  The 49:1 are sealed for weather protection.
 
C3 Electronics LLC 49:1 UnUNs (unbalanced to unbalanced) efficiently match the impedence of an end-fed half-wave antenna to a 50-ohm coax cable.