If you can’t get the antenna back on, make sure you replaced the speaker properly in the previous step. There is a small nodule on the top of the speaker that is supposed to sit under the plate for the antenna. If it is not replaced properly, it will be in the way of the antenna plug, and you won’t be able to connect it. I mucked around for half an hour before I realised this. Once I realise and fixed it, the antenna plugged straight in.