Today I crossed the Atlantic for the first time with my PRC-320. It was a QSO on the 20m band with W1/GI0MPT (Eamonn) from Massachusetts. He gave me a 55 report.
I was using the transceiver at full power with the 1.1mAh battery and a 4m-long military whip antenna. I do not have the exact reference of the antenna, but on the bag it says it is property of the NVA (National People's Army of the German Democratic Republic).
This is my default antenna at the moment. It works well with the Yaesu FT-857D and the FC-40 autotuner.