Replacement wifi antenna

I'm getting pretty poor wifi reception on my Shelly Uni, and I saw that the wifi antenna is replaceable. However, I'm having a hard time finding one that fits. I first tried this one but the connector wasn't the right one: https://www.amazon.com/gp/product/B07…e?ie=UTF8&psc=1. I then contacted Shelly support and based on their recommendation I got this one: https://www.amazon.com/gp/product/B07…e?ie=UTF8&psc=1. This one looked closer, but I still can't get it to plug into the socket. An online search has turned up nothing. Has anyone been able to replace this antenna?

Thanks! Any others you can recommend? I was hoping for something with more gain than 1.5DBi. Or maybe a way to ID other antennas that might also fit? I just wasn't sure to definitively know what connector type I'm looking for.

The first one was listed as IPEX (MHF2) and the second was IPEX (MHF4). Is IPEX-4 the same as IPEX (MHF4)? I wonder if the MHF4 antenna that I currently have actually does fit, and I just haven't pushed hard enough to get it to snap in? I can get the stock antenna on and off no problem so it seemed like this one just didn't fit.