This feed has been working for quite a while with Super RSS Reader without any issues. I just noticed that it was not working now.
It now yields the following error where it used to display results via Super RSS Reader:
RSS Error: A feed could not be found at https://njlocalinfo.com/ads/?s=&location=kenilworth+nj&scat=0&lat=0&lng=0&radius=10&st=ad_listing&feed=rss; the status code is 403 and content-type is text/html; charset=UTF-8
I ran the w3.org test successfully, but the feed is still not working on my WordPress site.