First of all, welcome to RR, you've made a very good choice joining this group as you shall see as time progresses. Read the RR WIKI section on HF receivers & other 2-30 MHz radio topics that may be of interest to you, also post any query you may have on the respective forum for a speedy reply. Personally for the money I have always favored the ICOM R-75 HF receiver, if that becomes your choice make sure the one you purchase has the DSP (Digital Signal Processor) module already installed, it can be had for an affordable price too, Enjoy.
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FLRAILMAN