There are several radio stations that focus on underground and independent hip-hop music. Some of the top ones include:
1. WFMU 91.1 FM (New Jersey, United States)
2. KEXP 90.3 FM (Seattle, United States)
3. KCRW 89.9 FM (Los Angeles, United States)
4. Rinse FM 106.8 FM (London, United Kingdom)
5. Triple J 105.7 FM (Australia)
These stations are known for supporting emerging artists and independent music. However, it's always a good idea to research and reach out to local or online radio stations in your area, as they may also provide platforms for independent hip-hop artists to submit their music.