I was routinely listening to Radio Australia and other stations using BST-1 Car Shortwave Radio with my PBA-MLA4 Mini-Whip antenna in the morning time during my commute. In my commute route there are a few particular points where I am suffering from MW station interference.
I have just obtained another whip antenna that was developed by the same manufacturer of BST-1. It is a 2-feet mobile whip antenna that looks quite normal.
Then I tried it today. The performance was actually much better than the Mini-Whip. There was no interference from MW stations. It was also interesting that when I tried these two antennas for Perseus SDR, the Mini-Whip peformed significantly better than this 2-feet whip. It seems that the design of BST-1 is optimized for this whip antenna.
WWCR 12160kHz (The video is just a demonstration and not a comparison of the antenna)