I have a FM radio module with Silicon Labs Si4703 integrated tuner module for Arduino. The module assumes use of headphones and use of ground wire as an antenna (advice is wire length of 1.1-1.45m). In my use case that is unpractical, because the output will be coupled with an amplifier nearby and all components will be inside an aluminum box.
I would like to decouple the antenna from the ground. In my research I found a Silicon Labs AN231 document which explains the function of the device, but nowhere could be found the information about decoupling the antenna.
As I am not experienced with RF, my question is, is there a simple hack that would allow me to connect an independent antenna? For example, by cutting the line from the headphones ground S1 to FMIP, connect the S1 directly to the ground and connect a dedicated antenna to the input of the LC circuit made of Lmatch and C4. Will I get a reception and do I have a need to change the value of Lmatch to get it to work?