Going to a park with the stock 25 foot cable and 9 foot mast I had the following results with the MFJ. With a setting of 15 5/8 and 44 1/4 inches I had:
140 MHz 1.3:1
145 MHz 1.0:1
150 MHz 1.5:1
K7RFW , 39,68 ( 36), 112,33 ( 96), 162. R2AE, , , 10-15 . 145.500 1.26