I had a similar issue where our meter box containing transmitter (three CT's), and another transmitter (one CT) on the PV system, were both some distance away from the receiver/display in the house. I could get one tranmitter but not both, so I thought I would try an external antenna.
The fasteners on the display unit took a bit of working out, but I got there in the end. My display unit previously suffered some damaged, so one side of the display to base pivot pin was broken and the thing used to flop on the base, another reason to have a peak inside!
Pics attached show the dismantled unit and the white pivot pins (one intact, one broken) can be seen.
I removed the existing red antenna wire and attached a length of small coax cable (3mmOD), with the intention of fitting a connector to the free end. A small hole drilled in the back cover of the EnviR display, got the cable out of the EnviR.
This would allow me to mount a small professional antenna on the outside wall, with its cable installed through the wall to the connector on the EnviR coax.
The screen of the coax was connected internally to the battery negative which had an unused pcb hole (Vss), nearby to the antenna connection point. You need a good soldering iron, good eyesight and a steady hand - I struggled but eventually succeded.
To trial it, I stripped back the screen to 173mm of the free end of the coax, to act as a temporary antenna.
Bingo,
it worked with the coax hanging on the cupboard door, and I had no need to drill through the outside wall.
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