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Gain of a Dipole Versus Height from ground - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


 Post subject: Gain of a Dipole Versus Height from ground
Posted: Thu Jun 23, 2005 3:24 am 
The gain of a dipole is (supposedly) well known at 2.15 dBi. However, this is only true for a dipole in free space and in practice most real world dipoles are going to be plcaed at a finite distance above ground. Unless I have a large carpet made from RF absorbent material (NO) then the only other option to ensure the dipole has the theoretical gain is to get it far enough from ground that it behaves as if it is in free space. The big question is how far does this need to be ? ANYONE CARE TO HAVE A STAB AT THIS ???



Posted  11/12/2012

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