Besides Lansing, It included the Tri-Cities (Saginaw, Bay City and Midland) and much of Mid-Michigan, then it was later expanded to include Jackson.
bᵻsˌaɪdz lˈænsɪŋ, ɪɾ ɪŋklˈuːdᵻd ðə tɹˈaɪsˈɪɾiz sˈædʒɪnˌɔː, bˈeɪ sˈɪɾi ænd mˈɪdlənd ænd mˈʌtʃ ʌv mˈɪdmˈɪʃɪɡən, ðˈɛn ɪt wʌz lˈeɪɾɚɹ ɛkspˈændᵻd tʊ ɪŋklˈuːd dʒˈæksən.