You don't always need to precisely cut your antenna if you have a part of it coiled up and switched. Here I take 4.6m of thin insulated wire and connected it to five shorter pieces (about 10cm long) wired across a rotary switch. This allows its length to be varied. The advantage of this is that you can cover about a 10% frequency range rather than the 3% that a fixed length antenna covers. This experiment was with a 1/4 wavelength vertical on 14 MHz but if you want to do it for 28 MHz I would suggest using about 2.3m for the vertical element and pieces of 5cm long across the contacts of the rotary switch. PS: If you liked this video please consider supporting Amateur Radio VK3YE by: * Subscribing on YouTube, * Checking my books page at https://books.vk3ye.com​​​​​​​​​​​​​​​​ to see if any appeal, * Shopping on Amazon via: https://amzn.to/3iiDQXv​​​​​​​​​​​​​​​​ , or * Shopping on eBay via: https://ebay.us/i9DuWP (then if you buy something I'll get a small commission at no cost to you) ... https://www.youtube.com/watch?v=9ObV_OpK1rQ

Another sliding variable capacitor. Goes up to about 30pF. ... https://www.youtube.com/watch?v=ekeTBGOyGyc

Whenever I go portable the most common question I'm asked over the air is whether passers by ask many questions. This video answers this and gives some examples. Some thoughts on portable station setup and operation in public areas are also provided. ... https://www.youtube.com/watch?v=p_e7sSwHcNs

Part 2 of a homebrew regenerative receiver that uses a 12AU7 powered from 12 volts high tension. This video shows the receiver inside a case and added coils for coverage of HF frequencies. Reception of AM broadcast, amateur and shortwave signals is also demonstrated. See Part 1 for a more detailed description of the circuit. The WIA's Amateur Radio magazine has full constructional details in its May 2012 issue. ... https://www.youtube.com/watch?v=9O6qUY7X4VA