If you have no experience with shortwave, start with established commercial equipment and antennas. Once you understand how they work, then consider building your own. If the commercial equipment malfunctions, you can confidently contact the vendor for after-sales service. If the vendor doesn't respond, you can also file a complaint against them.
If you don't have experience with electronics, start with simple circuits. Don't try to build a shortwave radio from scratch; otherwise, you're likely to end up wasting your time and effort. If your homemade radio malfunctions, you'll need to find the solution yourself. Group buys do not have an obligation to help you fix problems.
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