I want to get a high gain directional wlan antenna and I was thinking about a Cisco AIR-ANT3338 solid dish - they're pricey but I trust I'll get excellence from Cisco. I've also seen these parabolic grid antennas about which are a fraction of the price and yet advertise the same gain levels. Is there an advantage to getting the Cisco or am I just paying for the name? Thanks for any advice.