Which distance should i keep if taking an EMC EN55011 or EN55022 measurement with my Aaronia EMC bundle between the BicoLOG antenna and the SPECTRAN unit so that they dont influence each other?

If you use the X (USB Desktop) version of the SPECTRAN you only need a disance of 2-3m between antenna and SPECTRAN.
If you use the hand held unit, which offers much less shielding, you should keep a disance of 8-10m so better add a 10m low loss SMA cable to the order...