Smeary Spectrograph Meaning?

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Smeary Spectrograph Meaning?
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Running WSPR on 10m, using my G5RV 102' antenna, I get smeary bands. When I switch to my TransWorld ANtenna on 10m, the bands are well defined and distinct. What causes that smearing? Attached is a screen capture - G5RV on left and TWAntenna on right.