True, 5,000-watt WDEL is directional southeast, and even more so after the pattern-change at dusk.
Many nights around the DE/MD line and further west into Cecil County, the 50,000-watt, oldies station from Hamilton - CKOC - will dominate the channel... even during the summer.
That's always been WDEL's Achilles Heel in terms of coverage area. WILM sounds stronger in parts of Newark than WDEL.
Conversely, try driving to Dover and points farther south while listening to 1450.
WILM first gets interference (from Atlantic City) around the Smyrna rest stop... recovers some, but then suffers bleed from 1410 (no matter now with the substantial simulcast!) in north Dover... then peters out for the last time around Dover Air Force Base.
(If you had a highly directional portable, you can still get it right along the beach areas past Broadkill Beach even to Rehoboth!)
WDEL pumps a decent signal into Dover, and is listenable from Ocean City, Maryland.
At night, WDEL sometimes makes it to the North Carolina Outer Banks. But, that same directional signal has great difficulty making it into Pennsylvania communities just northwest of the DE/PA line.