In the shack I have two digital multimeters, both being manufactured by Fluke.
The Farnell SSG520 is a very easy to use synthesized signal generator. With an output range from 10MHz up to 520MHz and providing FM and AM signals.
Without doubt, the most indispensable piece of equipment to have in your toolkit when playing around with wire (or indeed any other type of) antennas is an antenna analyser.
An oscilloscope is a piece of equipment allows you to visually see the electrical signal.
When working with radio circuits it’s often essential to know that the operating frequency is correct.
To keep an eye on the SWR of my three antennas the Welz SP-300 does a cracking job. The nice large (100mm x 50mm) moving coil meter is very easy to read.