| Business | Phone |
| National 411 999 N Plaza Dr, Schaumburg 60173 | (847) 230-4344 |
| Antenna Systems &solutions Inc 931 Albion Ave, Schaumburg 60193 | (847) 584-1000 |
| Network Group 2354 Hassell Rd, Schaumburg 60194 | (847) 839-2530 |
| Vinakom Communication 1226 N Roselle Rd, Schaumburg 60195 | (847) 884-5960 |