Hi, this is a summary of my experience before and after the zwave antenna mod. I got all my info here (thanks all) And just wanted to share what I did, so that maybe other people take the chance and also do it.
English is not my main language
Before antenna mod:
I had my homey almost central in my home, and 4 Eurotronic Spirit Radiator Thermostats connected to it. All max 2-5 meters from the homey.
They where connected and 70% (probably less) of the time the command was send trough. I sometimes got errors like timeout or no acknowledge. I needed to pull the batteries out and let the thermostat restart. Then it worked again. I was really confused if it was the homey or the thermostats fault why the connection was not 100% proof. This was like for a full winter. And it was really getting annoying.
After antenna mod:
Its been a week now and all the 4 thermostats work perfectly, I haven’t had one error! It was clearly the small antenna of the homey. I even installed a door sensor now with zwave that is even further away then the thermostats and it works perfectly. I would advice people to do this also if you can do it, and you have connection problems.
I bought this antenna (europe): https://www.amazon.de/dp/B07CZMCJ8Z/ref=cm_sw_r_cp_tai_kcEwDb9V8FXE8
I have a homey early 2019
First i removed the top sphere. It was really good glued so i had to really cut into the sphere.
You need to cut above the LED strip
luckily the homey is not on display in my living room so it was ok that i damage it. Here you can see that i really had to cut it.
Then I de-soldered the connection in the yellow circle
Then i soldered the antenna to the board.
D -> the connection in the yellow circle
B -> the antenna of the homey that I just de-soldered
It’s been said here before that the B connection is not necessary. But make sure then that B is not touching anything else in the homey. I did it because then the antenna wire was kept more in place, because you will notice that the D wire is a really weak connection. And i wanted to keep the homey antenna in place so that when the external antenna would fail that I could just re-solder the homey antenna back.
The end result: