How Long Should This Antenna Be?

Since not everyone knows how long a dipole (or 1/4 wave vertical) antenna should be, because maybe they just don’t know or it’s been so long since they built one that they forgot, here’s an interesting website that has on it (among other things) some antenna calculators. For instance, your blogmaster (I know I just update the blog but that sounds so good I had to use it) wanted to know how long to make a 1/4 wave vertical antenna to put on a scanner for the aircraft band, so a quick search later and viola!