I have been playing around with different wire lengths for the Pekton unit (yellow wire in plug C0661 in pinout 1 which goes into the loom for a short distance)
No matter what variations of 1/4 and 1/2 wavelengths there was little or no difference in fob lock/unlock range.
I spoke to Paul (Technozen) and had a reply from him this morning "The Pektron SCU has no external antenna, the internal radio receiver board has an antenna on the circuit board. Poor radio range on these units is usually caused by the radio receiver board itself, it's a common problem" (Thanks Paul)
The yellow wire on the Pektron BCU (plug C0661 pinout 1) would normaly go to plug C0750 position 3 which would plug into switch S185. This is the control the re-circulated air for the AC (if fitted)
Lesson 1. The Pektron unit has no external aerial.
Lesson 2. Get all the information to hand before messing around.
Lesson 3. If you have poor remote lock/unlock on your TF stand closer to your car.
Lesson 4. I can remove and install the BCU in 30 seconds.
Brian.