[Hallicrafters] inverted V

[DAN COTSIRILOS]

thanks everyone for all the feedback. it is very interesting!  Dan
----- Original Message ----- 
From: "K6JEK" <k6jek at comcast.net>
To: "hallicrafters" <hallicrafters at mailman.qth.net>
Sent: Tuesday, February 22, 2005 11:38 AM
Subject: Re: [Hallicrafters] inverted V


> Folks,
> 
> I think we have an apples and oranges conversation going on here.  The 
> 1.5 dB difference compared to a dipole rule of thumb is not about loss, 
> it's about radiation pattern.   At a half wavelength above ground, a 
> dipole is a more directional antenna, with a deep overhead null and and 
> a reasonably low radiation angle -- 30 degrees.  The inverted V has 
> slightly more radiation going straight up and slightly less going out 
> at 30 degrees.  That's not loss.  That's signal going up instead of 
> out.  At lower heights, the dipole does not have the deep null and the 
> two antennas are just about equivalent -- high angle omni-directional 
> antennas. The analysis is for an inverted V with a 90 degree apex 
> angle.
> 
> Boiling it down.  There is no noticeable difference between a low 
> dipole and a low inverted V.    If you can manage one tall support, a 
> high inverted V is better than a low dipole.  If you can manage two 
> high supports, a high dipole is better than a high inverted V but not 
> much.  Don't put up inverted V's with narrow apex angles.  They start 
> acting like feedlines.
> 
> Jon
> 
>  On Feb 22, 2005, at 5:22 AM, Dan Cotsirilos wrote:
> 
>> Any ant experts out there? I read a article that a inverted V on 80 
>> meters loses about 3 db gain over a dipole. Does anyone know that if 
>> this is the same on 10 meters? thanks Dan
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