WiFi equipment comes with all sorts of antennas, from tiny ones to pretty big ones which supposedly give a better signal power. But what’s the actual difference between them? Just the shape and size of the plastic case! (this is about antennas included with most of the wireless equipment, not the extended range ones). Proof below:

WiFi antennas

From left to right: antennas from Linksys WRT54GL, from Asus WL-500GP, from a cheap PCI card and an AA battery (5 cm / 2 inch lenght) as a size scale.