| Business | Phone |
| Global Radio 2126 S Archer Ave, Chicago 60616 | (312) 326-5363 |
| Bearcom 811 W Evergreen Ave 204, Chicago 60622 | (312) 226-9999 |
| Erickson's E-Electronics Co 5622 W Diversey Ave, Chicago 60639 | (773) 889-7654 |
| Electronic Equipment Leasing 4336 1/2 W Lawrence Ave, Chicago 60630 | (773) 283-3370 |
| Chicago Communication Svc Llc 2100 S Peoria St, Chicago 60608 | (312) 829-2700 |
| Communications Direct 710 N Aberdeen St, Chicago 60622 | (312) 829-7770 |