I have been making a few 1/4 wave antennas lately, mainly for UHF and the GHz bands with good success, so I decided to create a calculator to simplify the process and maybe get some people who have not tried one before to give it a go.
For UHF for example, these can be made very cheaply, very easily and they perform well. Try one on 433MHz plugged into your handheld for example 
The 1/4 wave ground plane
The calculator is at m0ukd.com/calculators/quarter-wave-ground-plane-antenna-calculator/
