Topband: K9AY performs better on MW bcast and TB than 80m

[John - G3XRJ]

My new K9AY with 85 ft loops and Vactrol f/b is much better on Medium
Wave Broadcast band than 160m or 80m. MW f/b is 20/30db, 160 f/b is
15/20 db but 80m only 10db at best. Grounding is by centre stake and
radials under each loop. 
Sensitivity is good on 80m but very disappointed in f/b. 
Suspected re-radiation from shunt fed 40ft tx vertical 130 feet from
loops so I dropped the tx mast. No change in loop performance.

Any ideas please.   

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