"Well, I'm obviously committed to Iowa so they're No. 1," the '13 South Dakota wide receiver said. "But ever since the recruiting process started, I've been told that needed to make sure I chose the right place. I want to continue to explore my options just to make sure I've made the best choice for me."
Vandenberg has scheduled a visit to Wisconsin Saturday when it plays host to unbeaten Ohio State. He chose Iowa's gray shirt offer ahead of a preferred walk-on opportunity from the Badgers back in the summer.
"I've been talking to (Wisconsin Wide Receivers Coach Zach Azzanni) once a week on the phone," the 6-foot-1, 170-pound Vandeberg said. "They really liked by ball skills and my speed when I went to camp there. They said if they had a scholarship offer then that I would have gotten it."
Wisconsin still has a preferred walk-on offer on the table for Vandeberg. The Badgers are saying that a gray shirt is a possibility, he said.
"They want to see what goes on with the rest of the class and see how things end up as we get closer to signing day (in February)," Vandeberg said. "I do have to have some financial aid of some sort so I can't take a walk-on (at Wisconsin) over a gray shirt (from Iowa)."
Vandeberg said he has not discussed his Wisconsin visit or his desire to make sure his decision is the right one for him.
"I talk to Coach (Reese) Morgan once every week or two weeks," he said. "The subject hasn't come up. I'm sure I'll get a call soon and I'm just going to be straight up with them about how I feel."
Vandeberg said Iowa State has been inviting him to come to recent games in Ames.
"I've kind of put them off of the radar," he said. "It's Iowa and Wisconsin right now."
Vandeberg said he does not have a timetable for a final decision.
"I'm not going to concern myself with it until February," he said.