For anyone interested, here’s my feedback:
I modified the Sonoff bridge and reinstalled my quarter wave ground plane antenna (see above - located in the attic as my house has aluminium siding, much better reception);
I am now getting anywhere between 100 to 150 feet reception range; signal is loud and clear from all sensors, indoors and outdoors. Modified both my units (Tasmota/Portisch and OMG/Pilight)
Here are a few pictures of the Sonoff mod; have a close look at the hole placement as it could interfere with other components + small tape to avoid contact between receiver antenna and connector.
Use the nut to find hole placement (first 2 pictures), small hole first then drill 3/8.
You can probably use other/simpler antennas like the good old universal telescopic TV antenna but will surely have to fine tune and range will shorten.
Feel free to provide feedback on your own experiences/results.
Cheers.
