Hi Ray - I'm not familiar with the AT-803 but it sure looks exactly like the radiating element of the AS-390 standard UHF shipboard antenna.  Aka the "Spider", center fed dipole, 225-400 mc.  The mounting plate has radials welded to it, very bullet proof.  Radials at the base of a center fed vertical dipole?  Yup...
Tim
N6CC

On Wed, Oct 27, 2021 at 7:19 AM Ray Fantini <RAFANTINI@salisbury.edu> wrote:

I have a AT-803 Coaxial Stub antenna that to me looks like a fat vertical dipole. It appears to be designed for mounting on flat surfaces and covers 225 to 400 MHz Want to install it on my M151A1 and use as a receive antenna on the UHF aviation band with the URC-110

Figure I can throw together a bracket maybe attached to the mount of the 110 being that the back of the mutt is somewhat full of sticks now with the huge whip for the GRC-106, medium antenna for the RT-524 and small antenna for the VHF side of the 110 but the issue is that looking at the antenna it appears to me to be a dipole and figuring if it’s a dipole it won’t need a ground plane or radials but in seeing other beer can antennas think they may have had a ground plane attached.

Anyone have any thoughts about if this would need a ground plane or not?

 

Ray F/KA3EKH

 

 

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