You can make an omnidirecetional antenna for 5.8Ghz, or any other directional antenna you could make for 2.4Ghz, it's just going to be a little less than half as big. The directionality is more like the difference between AM and FM, where AM will usually reach into a short tunnel or over a hill, while FM needs almost line of sight. But if you ever did a double slit experiment in physics you've seen even visible light at nanometer wavelengths isn't completely line-of-sight. Both 5.8Ghz and 2.4Ghz are at millimeter wavelengths, 2.4Ghz will have about twice the corner cutting abilities of 5.8Ghz, but the 802.11 power levels are too low with respect to the receiver sensitivity to matter much.
If you want to make a homemade antenna any of the web pages with formulas should do, http://wireless.gumph.org/ is already scaled down from a 440Mhz antenna. The only thing to really worry about is the impedence being wrong. But I've never heard of anyone burning out a 802.11b or 802.11a card with the wrong impedance antenna so the real fear is that it will decrease your ERP (i.e. lower the dBi of the antenna). You will want to be even more careful with your spacing too. -- Daniel <<You cant eat before a operashun. Not even cheese.>> -- Charlie Gordon On Sun, 20 Oct 2002, Terry Ewing wrote: ]Hmmm. The superpass antennas appear to be directional. I'm looking for ]more of an omni. I know the higher you go in freq the more directional it ]gets. Is there no such thing as an omni for 5.8ghz? ] ]----- Original Message ----- ]From: "Terry Ewing" <[EMAIL PROTECTED]> ]To: <[EMAIL PROTECTED]> ]Sent: Saturday, October 19, 2002 1:10 AM ]Subject: Re: [nycwireless] 802.11a antennas ] ] ]> Anyone have thoughts on retrofitting a cordless with an antenna? ]> ]> ----- Original Message ----- ]> From: "Terry Ewing" <[EMAIL PROTECTED]> ]> To: <[EMAIL PROTECTED]> ]> Sent: Friday, October 18, 2002 4:46 PM ]> Subject: [nycwireless] 802.11a antennas ]> ]> ]> > Hello, ]> > Anyone have any good links for 802.11a antennas? I'm actually ]thinking ]> > of putting one in a new uniden phone. :) ]> > ]> > -Terry ]> > ]> > -- ]> > NYCwireless - http://www.nycwireless.net/ ]> > Un/Subscribe: http://lists.nycwireless.net/mailman/listinfo/nycwireless/ ]> > Archives: http://lists.nycwireless.net/pipermail/nycwireless/ ]> > ]> ]> -- ]> NYCwireless - http://www.nycwireless.net/ ]> Un/Subscribe: http://lists.nycwireless.net/mailman/listinfo/nycwireless/ ]> Archives: http://lists.nycwireless.net/pipermail/nycwireless/ ]> ] ]-- ]NYCwireless - http://www.nycwireless.net/ ]Un/Subscribe: http://lists.nycwireless.net/mailman/listinfo/nycwireless/ ]Archives: http://lists.nycwireless.net/pipermail/nycwireless/ ] -- NYCwireless - http://www.nycwireless.net/ Un/Subscribe: http://lists.nycwireless.net/mailman/listinfo/nycwireless/ Archives: http://lists.nycwireless.net/pipermail/nycwireless/
