I have used both a U664B and a NEC uPD358 (?) as prescaler. The U664B
comes in DIP 8pins or SIL 6 pins. The pinouts are:

DIP8:

1 NC
2 Input 1 couple through 1nF
3 Input 2 ground through 1nF
4 GND

5 SEL or NC connect to VCC
6 Output 1 0.8Vpp
7 Output 2 0.8Vpp
8 VCC

The layout is not critical, just put a 1/3" wide copper ground line
completely enclosing the chip area, as close to it as possible (and under
it). Draws 50mA at 5V.

Peter

PS: There are some newer scaler chips available that are SMD. I have never
used those but if someone has, please say so. I am interested in something
that goes to 3-4GHz for work in the 2.4GHz area.

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