Amazon.com: 300M High Speed Wall Wireless WiFi Router with 4 Antenna, Stable Home Network, Secure Encryption, Reduced Interference, US Plug 100-240V (Quad Antenna Router Through The Wall)
Online Calculator .:. Bi-Quad Antenna
Service and User Manual - Mini-Products Inc. HQ-1 - Antenna -- dsm title
Basics of antennas
Chameleon HYBRID-MINI Wide band Wire antenna 1.8-54 MHz