RetroTV is available on both Daystar stations:
13-2 which is WPXS. They broadcast from a cell tower-like structure near Breese and try to send a single to cover the cable head-ends in both St Louis and Mt Vernon. Edwardsville is fairly well off to the side of the very narrow main signal lobe of their antenna and reception of their channel 21 signal will be hit or miss in Edwardsville unless you really work at it and have some luck. Unless you're near the I64/US50 corridor in Illinois, dont expect reliable reception of this signal.
16-1 which is KDTL-LD. this is a low-power digital broadcasting at only 15,000 watts from the main antenna farm in Affton just south of I44 just outside the St Louis city limits.
A ClearStream 2 aimed at St Louis wouldn't be expected to pick up much of the WPXS signal, so, if it's very sporadic, that would be expected.
BTW, you don't need the VHF attachment of the C2V for St Louis television reception. I'd suggest removing it and simply hooking up to the back of the loop.