Presuming your coax and antenna connections are all securely wrapped *AND* the fact that you're receiving them well at times, suggests it's not a hardware issue. It could be related to ionospheric conditions but those affect HF primarily.
The cheapest solution I can think of would be:
1. Check your antenna connections and hardware no cracks in insulation, no water inside PVC antenna, etc.) 2. Make a trip to HD or Lowes and buy a 10ft piece of EMT conduit -- about $10 for a 1.25" piece 3. Mount the DBJ-1 onto the EMT conduit
Another idea/suggestion would be to buy a cheap AM SW portable radio (Tecsun PL-380 is roughly $43 and sweep your house and neighborhood for any obvious RFI that could be causing interference. Powerline interference is notorious for causing issues. But in this digital age, there's plasma TVs, Broadband over powerline and a ton of other RFI garbage. Search in AM mode on say 7mhz, 11mhz, 15mhz and 28mhz, (When you hear RFI you won't mistake it for anything else. It's usually quite obvious.)
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