I own the AR8600 and always thought the sensitivity was great on HF....I see the specs for the AR5001 are not as good as the 8600 in the HF range...How does the 5001 D perform down there on HF regarding pulling out weak signals compared to the 8600?...I was always amazed at how quiet the 8600 was down there compared to other brands of SWL receivers......thanks in advance