ASUS RT-N12HP High Power Wireless-N300 3-in-1 Router, AP, Range Extender Offers Huge Radius, Even Bigger Rabbit Ears
The new Asus RT-N12HP is that device, and it purportedly offers up to 300 percent wider wireless coverage compared to standard N300 routers. Getting that kind of range required a custom hardware architecture augmented with detachable 9dBi high-gain antennas and a discrete signal power amplifier, Asus says.
Source: Asus

This is a single band router operating on the 2.4GHz frequency. It has four 10/100 BaseT LAN ports on the back and supports various security protocols, such as 64-bit/128-bit WEP, WPA2-PSK, WPA-PSK, WPA-Enterprice, WPA2-Enterprise, and WPS.
No word yet on price or availability.