Earlier quoted context omitted.
Is there some improved BT technology out there? I’ve seldom seen it go more than 20 ft or through a substantial wall.
Wikipedia says this about Bluetooth: > In the most widely used mode, transmission power is limited to 2.5 milliwatts, giving it a very short range of up to 10 metres (33 ft). But that's not really how radiation works. You can transmit more by using more power, sure. The louder you shout, the easier it is for people to hear you. You can also receive more by having a bigger antenna. The harder you listen, the more you…
What the antenna size/shape can affect is the directionality of the beam. By emitting the same power directionally, you can increase the range in some directions at the expense of reducing the range in all other directions. But the total power would be still the same.
Also the reception gain is actually the same thing as emission gain. You cannot make a passive antenna that has better reception without making it more directional, which means worse reception from some other directions. You cannot improve reception from all directions by making a bigger antenna.