Radio: Plugs into the USB port on your PC
This has now been superceded by the RSP1A
Antenna: Cheap and cheerful loop. If you've got a big garden a long piece of wire will do as a starter.
Recently Chinese manufacturers have begun producing a low cost wide band (100 kHz - 30 MHz) magnetic loop HF antenna known as the MLA-30. The loop can be found on eBay for under US$45 with free shipping. In the past wide band HF loop antennas have not been cheap, normally costing $300+ dollars...
www.rtl-sdr.com
All the real work is done by the software on the PC which is a bit hard to get you head round at first but there's a full suite of videos on on Youtube that explains it all.
www.youtube.com
The RSP1a is nothing like the Lowe or any other conventional receiver. It's far more capable.
If you yearn for the old days keep your eye out for a Lowe or FRG7 on Ebay.
If you want a palm sized plastic box that can do anything from listening to GQD talking to the nuclear fleet on 19.6KHz (although you won't know what they're saying

) to listening to NOAA satellites and much else in between get yourself an SDRPlay. Designed and made in the UK with super support and a brilliant series of videos made by a Yank called Mike
Here's mine...
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