10-60 db attenuator

T pad  in and out resistors to ground 51 ohm

resistor between in and out:
10 db = 51 ohm (71 ohm ideal ground)
20 db = 220 ohm (61 ohm ideal ground)
30 db = 820 ohm
40 db = 2.7 kohm
50 db = 8.2 kohm
60 db = 27 kohm

values are not ideal, but are common resistors
grounding resistors SHOULD be higher values (60-70 ohm) for 10 and 20 db
but you can use a dp6t rotary switch and just leave those two grounded off the common, OR if you have a lot of 50ish resistors you can make those dedicated also with adjusted values

a dpdt toggle switch is also needed to allow for the attenuator to be out of line completely (0db attenuation).  Get one with center-off to allow for antenna-out-of-line (air gap connection in switches) only also for maximum attenuation.
or use a relay for a better air gap.

make a -20db T atten with two 39 ohm and one 10 ohms
make a -40db T atten with two 47 ohm and one 1 ohm