Replacing those rubber Antennas with a Directional one

I have a Draft N adapter (rt2860 chipset Airlink101) I'm using in 'G'
only mode to a Linksys two antennae Router.

Now the 'N' pci adapter has a three element loom and a three element
Antenna cluster on one end.

What I was wondering is a twofold question:

A) Would I benefit from retaining all three antennas ( esp when I
don't think I have any dual channel type equiptment) vs just going
with a single (albeit directional) unit &

B) Might I somehow need to be wary of a different antennae burning out
and/or drawing too much, not providing enough load, for the onboard
radio?



For example;
http://www.weirdstuff.com/cgi-bin/item/11546#
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MAXRAD 2.4GHz-Range MP Series +8 dBi Panel Antenna
MAXRAD 2.4GHz-range MP series panel antenna. Perfect for indoor/
outdoor Wi-Fi communications, or for any other form of microwave
communications withing the 2.4GHz-range! This antenna provides a very
precise directional control of your signal, with only 60-degree
vertical/horizontal beamwidth. Perfect for pointing your signal to
exactly where it needs to go! This antenna also features a +8dBi gain
for ensuring you've got excellent signal strength!

Specifications:

* Frequency Range: 2.3 - 2.5 GHz
* Gain: 8.5 dBi
* VSWR: <1.5:1
* 3 dB Horizontal Beamwidth: 60-Degrees
* 3dB Vertical Beamwidth: 60-Degrees
* Front-To-Back Ratio: > 15 dB
* Dimensions: 5.1 x 4.7 x 1.5 -Inches (12.9 x 11.9 x 3.8 - CM)
* Weight: 0.5Lbs (0.23kg)
* Temperature Range: -40 to +70 Degrees Celcius
* Cable: 3-Foot
* Connector: Reverse Polarity SMA Male
* Mount: MPAB11 Adjustable Azimuth/Elevation Wall-Mount

This antenna comes new in OEM packaging. Includes antenna, instruction
sheet, mounting bracket, mounting instruction sheet, and hardware.
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