SURF SOHO external antenna

I added two Super Power Supply 9dbi antennas to my surf soho and my wifi range decreased.
What would be a recommended external antenna for the surf soho to extend the range?


Hi J.R., those antennas have very mixed reviews and a lot of others have had a similar experience. I would go with a different brand altogether.

Does anyone have a recommendation for external antenna’s for the surf soho?