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Never driven a big rig; but I have gone to Disneyland!

All kidding aside, I do know a little about the truck's co-phase system. Some guys on the forum still do it and will probably pipe up and say something.

The co-phased antennas are supposed to be 9 ft apart - or 1/4 wavelength. But the antenna is the most important part. The radio and the amp are practically meaningless in comparison the the antennas quality and function. Don't know if I would go with a short whip; pretty sure I would use as long as I could get.

http://www.bellscb.com/cb_radio_hobby/antennas/antarray.html

Some top loaded 5 ft sticks would be as weak as I would want to choose. Shorter might be a convenience; but it can also be a compromise. The Workman Coil antennas are both cheap and extremely efficient, and only $39 each. Think I would do that, as performance, cost, and height limitations would be my reasons.

http://cbradiomagazine.com/Antenna Reviews/Viper/Workman Viper Antenna Review.htm

Best wishes with your project.

<blockquote data-quote="Robb" data-source="post: 324618" data-attributes="member: 8446">Never driven a big rig; but I have gone to Disneyland!All kidding aside, I do know a little about the truck&#039;s co-phase system.&nbsp; Some guys on the forum still do it and will probably pipe up and say something.&nbsp; The co-phased antennas are supposed to be 9 ft apart - or 1/4 wavelength.&nbsp; But the antenna is the most important part.&nbsp; The radio and the amp are practically meaningless in comparison the the antennas quality and function.&nbsp; Don&#039;t know if I would go with a short whip; pretty sure I would use as long as I could get.<a href="http://www.bellscb.com/cb_radio_hobby/antennas/antarray.html" target="_blank">http://www.bellscb.com/cb_radio_hobby/antennas/antarray.html</a>Some top loaded 5 ft sticks would be as weak as I would want to choose.&nbsp; Shorter might be a convenience; but it can also be a compromise.&nbsp; The Workman Coil antennas are both cheap and extremely efficient, and only $39 each.&nbsp; Think I would do that, as performance, cost, and height limitations would be my reasons.<a href="http://cbradiomagazine.com/Antenna%20Reviews/Viper/Workman%20Viper%20Antenna%20Review.htm" target="_blank">http://cbradiomagazine.com/Antenna Reviews/Viper/Workman Viper Antenna Review.htm</a>Best wishes with your project.<img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f44d.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":thumbup:" title="Thumbs Up&nbsp; &nbsp; :thumbup:"&nbsp; data-smilie="27"data-shortname=":thumbup:" /></blockquote>

[QUOTE="Robb, post: 324618, member: 8446"] Never driven a big rig; but I have gone to Disneyland! All kidding aside, I do know a little about the truck's co-phase system. Some guys on the forum still do it and will probably pipe up and say something. The co-phased antennas are supposed to be 9 ft apart - or 1/4 wavelength. But the antenna is the most important part. The radio and the amp are practically meaningless in comparison the the antennas quality and function. Don't know if I would go with a short whip; pretty sure I would use as long as I could get. [url]http://www.bellscb.com/cb_radio_hobby/antennas/antarray.html[/url] Some top loaded 5 ft sticks would be as weak as I would want to choose. Shorter might be a convenience; but it can also be a compromise. The Workman Coil antennas are both cheap and extremely efficient, and only $39 each. Think I would do that, as performance, cost, and height limitations would be my reasons. [url]http://cbradiomagazine.com/Antenna%20Reviews/Viper/Workman%20Viper%20Antenna%20Review.htm[/url] Best wishes with your project. :thumbup: [/QUOTE]

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