I is not the headphones that act as an antenna but the wire to the headphones that is the antenna. The reception to expect no matter what radio you use will depend on the signal strength were you are using the radio. It will also depend on whether you are using AM or FM. The head set wire is the antenna for the FM. The AM antenna is built in. FM signals are much more directional than AM. With a stationary radio you can move the antenna for best FM reception and leave it alone but when the radio is moving then the signal can fade in and out. I use this radio to listen to CSN Christian network and it is the only Christian station that comes in fairly well in my area so I have no other choices. That station comes in fairly well but there is some fading in and out. In my area it even changes with what part of the yard I am in. When I walk some areas of the path I take will vary. So, there are a lot of variables but as far as the antenna is concerned it is not the headphones but the wire to the headphones. I bought a different set of headphones and they have a longer wire. As far and the reception of the radio itself, it does really well for a small radio. Sony usually does well in the reception area. When I walk with the radio I sometimes carry the wire in my hand so I can move it around to improve reception. That wouldn't work well on a bike. But if you listen to talk radio on AM and the signal is good then you should not have a problem. Hope that helps.
Yes-There is nothing fancy about this radio, BUT it has run all night when I fall asleep about 5 times and it is still in the same AA battery. It is supposed to run for 99 hours on a SINGLE battery, I believe them. It is pretty easy to find stations, BY DIAL. MANY STATIONS. Best radio I have had. Kind of old fashion + no speakers. Switch to change from AM/FM. BUT great reception.