Rig and Twig set-up question... Help ?

Sorry, I speak English, but let me see if I managed to translate this correctly:

You are wanting to run two phased antennas on your truck. If so, then it will not work correctly with what you have listed.

Instead of a "T" connector and two pieces of coax, you need a specially made "phasing harness". These are designed for two antennas placed a specific distance apart; and the commercially made ones are generally made for 108" apart.

Getting phased antennas to work properly is a LOT of work, and there really isn't a noticeable improvement over a single antenna, everything properly installed. If dual antennas are not installed correctly, it can cause a serious degradation of your signal.

My personal recommendation is to go ahead and mount both antennas, but only connect one to the radio. That way, you have a spare ready if the active one gets broken.

 

On a tractor trailer I always recommend using co-phased antenna systems unless it is a flat top truck pulling a flatbed trailer. Phasing harness needs to be constructed of 270° of 75 ohm Cable per side. Technically 90° of cable could potentially work but I've never been able to get much success using that short of a harness.