You could replace your FM broadcast antenna with a FRS/GMRS antenna using whats called a Duplexer. It splits the radio signals based on the frequency..https://www.dxengineering.com/parts/cma-cf-142
Broadcast radio is 88-108Mhz which is VHF - https://www.fcc.gov/general/fm-radio
FRS/GMRS is...