Owned a Caprice WH Series 2 V8 5.7L since new, 22 years and somehow today I went through an automatic car wash with the aerial up and it has snapped.

My research tells me I need to buy one of these.
https://www.ebay.com.au/itm/303760310238?_ul=AU

Before I go ahead and do that, I'd like to ask

1) Is this the only option? If not are there cheaper options?
2) I'm reasonably handy but not an auto electrician by any stretch. How difficult would this be to install myself? Any guidance on how?
3) Is it possible to buy and replace the mast / rope only since the module itself still works? If so what would I buy?


Thank you