Long MS Ping or something else?

[NickNJ]

Had a 15 second long burst from WJXA 92.9 in Nashville at 1810 today (matched song to Yes.com), attached a clip. Was strong, is it likely an MS ping, or could the length of it mean it might be something else?

Thanks,
Nick

[Russ-PA]

Nashville would be reasonable distance for MS, and would be short for Es. But although 15s seems long, I'm not an expert on MS - I get very little of it.