I must be doing something wrong. My stock antenna has always been just fine. I can receive more stations than I have presets for, both AM & FM.
I went back to the stock antenna only because it's more bendable and forgiving to the items I strap onto my luggage rack. I rarely listen to the radio since I've got so much music on my USB drive, and the volume of the radio is lower than AUX is.
You can check your local auto parts store and get an aftermarket one.
2016 F6B Standard Matte Silver. Freedom Combat Slip-Ons, BaggerShield 11" - 19" Sport Shield, Kuryakyn Ergo II Highway Pegs, Ultimate King Seat w/Driver Backrest, Pathfinder Running/Turnsignal/Driving Lights, Beeline Moto Navigation, INNOVV K2 Camera, DHS Racing Shifter Linkage Upgrade, Show Chrome Handlebar Risers and Luggage Rack.