800mhz base antenna

[Srobo]

I am looking for an antenna to mount in my attic to monitor an 800mzh system. I have read Yagi's are directional but the system I am listening to has three towers right now and will eventualy have a fourth. What would be a good choice for multiple towers?

 

[DickH]

I am looking for an antenna to mount in my attic to monitor an 800mzh system. I have read Yagi's are directional but the system I am listening to has three towers right now and will eventualy have a fourth. What would be a good choice for multiple towers?

If it's a trunked system and the towers are Simulcast, it won't matter since they will all transmit the same info. simultaneously.
Here's one you can make yourself. Dimensions and material are in the caption.
http://www.pbase.com/dickh/image/27104369

 

[Srobo]

It is the Indiana Safe-T system which is a trunked statewide system. I don't think they are simulcast. Someone else might have more information on this. I receive the Greenwood PD and Fire on the three different towers. One is in another county.

 

[ig00r]

I have an andrew ASPJ-810 antenna, yagi 800-960 mhz antenna 12 dB. If you are interested msg me at igor@peenutsteam.org bye

 

[iMONITOR]

I am looking for an antenna to mount in my attic to monitor an 800mzh system. I have read Yagi's are directional but the system I am listening to has three towers right now and will eventualy have a fourth. What would be a good choice for multiple towers?

Are the towers all on their own separate control channel frequency, or are they sharing the same one? If they're all the same, then you have a simulcast system. We have a few simulcast systems in Michigan, and Uniden scanners in particular have difficulty with them. These simulcast systems are using CQPSK modulation (Compatible Differential Offset Quadrature Phase Shift Keying). The Radio Shack (GRE) PRO-96/PRO-2096 scanners cope with these systems better than the Unidens.

When monitoring a simulcast system with a Uniden, I found using a Yagi antenna directed at only one tower seems to help.

If is is not a simulcast system, than you would be better off with an omni-directional antenna like DickH suggested.

 

[Srobo]

They are all different control chanels. I'll change my search to the omni-directional.

Thanks for your help.

 

[madnachos]

If it's a trunked system and the towers are Simulcast, it won't matter since they will all transmit the same info. simultaneously.
Here's one you can make yourself. Dimensions and material are in the caption.
http://www.pbase.com/dickh/image/27104369

Thats a slick little antenna...performance good?

 

[DickH]

Thats a slick little antenna...performance good?

Works fine, just like any other 1/4 wave ground plane antenna.