can please anyone post his opinion about building a wireless network that passes over 54mbps
i have 2 433ah but what do i need wireless cards and what antenna should i implement(no dishes)
please help
distance between the 2 locations is 4km max
this is a great card:
http://routerboard.com/product/97
get that, and then some good quality panel antenna with enough gain. you can use link budget calculators to estimate what kind of gain you need for good signal.
then choose frequency that is less crowded (use RouterOS snooper, spectrum analyzer and scan tools to find the best frequency)
This calculator. http://www.mikrotik.com/test_link.php
Signal polarization
The latest technology introduced dual polarization in wifi. Antennas are transmitting two signals using two linear polarization planes crossed in 90 degrees. Practical implementations include Point to Point links using N-stream technology from MikroTik and connections using 802.11n standard in 2T2R configuration.
a good setup could be an Arc integrator panel type antenna. here is a list of parts, i’m feeling
generous right now.
2 X http://streakwave.com/Itemdesc.asp?ic=ARC-ID5823B88&eq=&Tp=
2 X http://streakwave.com/Itemdesc.asp?ic=ARC-IE2000K01&eq=&Tp=
4 X http://streakwave.com/Itemdesc.asp?ic=5210004-003&eq=&Tp=
you’ll probably want this as well.
2 X http://streakwave.com/Itemdesc.asp?ic=RJ45-ECS&eq=&Tp=
the 433AH can be made to fit into the enclosures, but its extremely tight. i know from experience, as i have stuffed a few of them in there 
alternatively you can use them as just antennas and use a sma to n-female bulkhead pigtail out the bottom of the enclosures and then use an 2 x mmcx → n-female bulkeads on a seperate enclosure and use 2 x CA400 rf jumpers inbetween for dual polarity.
a little more complex but works fine.
Edit: Note RB433 in Arc Enclosure. TIGHT!
If you use different-length standoffs, you can make some more room for yourself using the Z-axis as well. Don’t ask me how I know… 