The Slim Jim antenna is a cousin of the J-Pole with increased RF energy at the horizon. I like it because it is easy to build and has about two S-Units over a quarter wave vertical for line of sight
> > >  Click on project picture for more details!  < < <
Vector Antenna Analyzer for antenna testing with high quality data graphics and data file exports, sweeps,

frequency plots, Smith charts, alerts and data file exports using a web browser on any OS / platform; MAC, PC, Linux, Android, tablet and even a cell phone. The key element is the analyzer controls and display are a simple website sever to communicate with any browser. 
The vertical full wavelength loop antenna is a great DX antenna without the problem of installing radials.The key word is VERTICAL as horizontal loops simply do not work very well 10 feet above ground level. In contrast vertical loop can be at ground level and still have low take off angle.

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Did you grow up in the era of electronic kits started by Heathkit, THE supplier of electronic kits? 

BALUNs are a tricky business and difficult to understand but still easy for most to build
DIY construction of a Dual Core Guanella BALUN provides efficiency and common mode isolation
Spiral Dipole is different twist on  multiband HF antennasHomebrew 40M spiral dipole; Similar to a screwdriver in efficiency but easy to match. Just three feet long!

Radio is a diverse hobby with many interesting facets -- CW, SSB, digital modes, satellites, etc.  Some Amateur Radio stations use high power transmitters to bounce signals off the moon reflecting back to earth however others make worldwide contacts using tiny transmitters powered by a flashlight battery to test their operating skills in long distance communications. My interests are in building HF, VHF and UHF antennas with operation in digital modes under 10 Watts. Not quite the operating on flashlight battery, but close, more like a nightlight. I live in a deed restricted community so my information is based on working within the confines of those “no antenna” restrictions. My purpose is to share my projects and ideas with anyone who is interested. I hope you will find this information useful, but if you are looking to build towers with beam antennas or extravagant antenna arrays, you will have to look elsewhere. HAMS are known for collaborating on technology. All amateur radio operators are welcome to copy and share this information for your own experimentation with radio technology.    73     KN9B