Ideally solder it on..but to try it out an electrical choc block thingy will do .( typically white or black small block with little screws in, used to join cables together in house wiring junction box etc..)

Re making the loop..Chris used am imaginative idea of a “hula hoop”. Just tape wire to it..(frame for loop needs to be non conductive.) so no good tapping wire and resistor to say an ali bike rim.