More or less, it really helps if it's the right length (as posted near here). An easy way to make one is to calculate 246/Frequency for a 1/4 wave antenna. So around the two meter / 144 Mhz ham band: 246/144=1.5 feet. The example in the video he's at ~440 Mhz so : 246 / 440 = 0.6 feet ~6 1/2 inches. You can make a "ground plane antenna" with a connector and coat hanger wire that will improve both the reception and transmission. At 50 Mhz where lots of doorbell items are it would be 246/50: ~5 feet of wire. In which case you can go for 1/8 wave length, about 2' 7'.
Somewhere in the posts is a suggestion to build a lowpass filter and that will work. But the Pi puts off some pretty messy spectrum splatter, so before you build a good antenna take a few mins and build a narrow passband filter. It cuts the splatter below (like a lowpass) and above (like a highpass) your chosen frequency.
Better yet, go to QRZ.com and look up a ham in your area to help you out. We have parts in our vast inventory of supplies (aka junk box) to help you out.
If it doesn't have the right length, impedance, and possibly orientation it's going to be significantly less effective. Even at this scale it probably makes sense to distinguish a wire antenna from a wire on that basis.
For more powerful equipment getting the wrong wire geometry could melt your expensive setup and get you in trouble with the FCC, so it makes even more sense to tack on the word "antenna" to mean "I've thought about this chunk of metal outside the DC approximation."
Somewhere in the posts is a suggestion to build a lowpass filter and that will work. But the Pi puts off some pretty messy spectrum splatter, so before you build a good antenna take a few mins and build a narrow passband filter. It cuts the splatter below (like a lowpass) and above (like a highpass) your chosen frequency.
Better yet, go to QRZ.com and look up a ham in your area to help you out. We have parts in our vast inventory of supplies (aka junk box) to help you out.