Ion-radio can't read value outside of ion-content

I have the controller set in the .config, so I shouldnt need to use ng-controller

.config(function($stateProvider, $urlRouterProvider) {
  $stateProvider

  .state('welcome', {
    url: '/welcome',
    templateUrl: "views/start.html"
    controller: 'WelcomeCtrl'
  })