Sure, you can put 2 100 ohm resistors in parallel like 2 100 ohm dipoles driven in phase for a lazy H beam, but, there is a big BUT. BUT the Cantenna uses a collection of resistors in a series-parallel configuration for greater heat transfer to the transformer oil in the can.

Outside of the can or other grounded shield a dummy load for dummies makes a perfectly matched antenna. I found out when a test was heard a few miles away from my basement radio room. I remember a how to article on making a wide band mobile antenna with a 1:1 match from 1.8 to 29MHz in an April issue of QST.