He said to his wife: You will be haraam for me if you do such and such

Praise be to Allah.

Firstly: 

In the answer to question no. 81984 we have explained the ruling on one who declares his wife to be haraam for him and that if he intended thereby divorce, zihaar or an oath, then the matter is as he intended, but if he did not intend anything then he must offer the expiation for breaking a vow (kafaarat yameen). 

Since you say that you did not intend anything and you did not know the ruling, then you have to offer the expiation for breaking a vow, if your wife used the receiver, but if she did not use it, then you do not have to do anything.   

Secondly: 

With regard to your question: Can I set up the equipment again? 

If you are going to set it up to use it for beneficial purposes such as watching Islamic programs and lectures, etc., there is nothing wrong with you setting it up, but you have to offer the expiation for breaking a vow, as stated above. 

But if you are going to set it up to use it for watching movies and immoral programs etc., this is undoubtedly haraam, and it poses a danger to you and your wife and children. 

And Allaah knows best.