What a story! The same was with me a couple of months ago. Check out this mobile tracker free www.hoverwatch.com/ This software has excellent functionality. Apart from location tracking, you have many other features. After recording, all calls are uploaded to your personal account, where you can listen to them at any time. I worked pretty well for me actually. So, simply give it a try
First, you should line yourself up a very good lawyer since this is illegal in all states if your husband is talking to a third-party and neither knows you are recording. In a one-party consent state like New York, you can record calls between you and your husband, but you cannot record anyone else who doesnt know this is going on. In a one-party consent state it is the same as taking notes.
So, unless the phone call is with you and both of you live in a one-party consent state, you are guaranteeing a very bad settlement and possible jail time. A mother who tried this against a schoolboard got a two-year sentence instead of the results she was looking for. Illegally obtained evidence cannot be used in a court and can be proof against you in a lawsuit or criminal case.
Any spyshop can tell you what equipment to use, but none of them will front your bail.