[TowerTalk] antenna quiz?

[30KR239 Fernando]

Hello,
I´m in the process of buying a new antenna, an Optibeam OB10-3W. I´ve been told that this antenna presents an impedance of 25 Ohms at the feedpoint that´s what I would need to use the 5 Kw (2:1) balun from Array Solutions. My questions are....isn´t it a too low impedance?...would it affects the antenna´s performance on any way?...Thanks in advance. 73s!
EC1CT Fernando
E-mail: ec1cwg at dxhunters.com
URE & ARRL member