A bit old here.... But check out:
http://www.odessaoffice.com/wireless/antenna/how_to_pick_the_right_antenna.htm
There are radiation pattern examples there. As a general rule I'd have to
say that yagi's are quite a bit better than grids.
laters,
Marlon
(509) 982-2181 Equipment sales
(408) 907-6910 (Vonage) Consulting services
42846865 (icq) And I run my own wisp!
64.146.146.12 (net meeting)
www.odessaoffice.com/wireless
www.odessaoffice.com/marlon/cam
----- Original Message -----
From: "Tom DeReggi" <[EMAIL PROTECTED]>
To: "WISPA General List" <wireless@wispa.org>
Sent: Monday, November 14, 2005 5:09 PM
Subject: [WISPA] 900Mhz Grid vs Yagi
PacWireless makes a 900Mhz 18 dbi Parabolic grid antenna.
M2 makes a 900Mhz 17.5 dbi Yagi antenna.
We had found that 900 was very particular to placement, even a few inches
in one direction or the other can make big differences in link quality.
Has anyone used both antenna types for a specific link, to compare the
properties of each of the designs. The thought is whether the wider
surface area of the parabolic antenna would make it better to survive
signal obstruction from swaying trees in forests. The prabolic is a
monster at 3 ft dia, s othe Yagi would clearly be a better choice for a
roof top chimney install based on cosmetics. But wondering from a
performance perspective the comparison.
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
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