A:Answer The RX-V685 has two (2) transmitting/receiving antennas located on the back of the unit in the upper left & right corners.
The antennas are identical, but transmit different frequencies, 2.4GHz and 5GHz.
I know these antenna both receive and transmit because I have my RX-V685 "paired" with a tablet device, and a 21 year old
Yamaha RX-596 stereo receiver at another location. A Logitech Bluetooth adapter (receiving antenna) is now the Tape-1 input.
The RX-V685 allows full house coverage.