These baluns and ununs can be used for impedance matching and also as End Fed halfwave antenna matching transformers to 50 or 75 ohm coax cable.
Ham Radio Outlet Products
HRO stocks many Palomar Engineers products including RFI solutions and antenna products.
Need a quick overview to solve your RFI problem? Click on the RFI Cheat Sheet or RFI Solutions Tip Sheet
Palomar Engineers Antenna Info Sheet