High frequency rf resistors
For your application I would suggest the use of Metal foil Resistors.A specific foil alloy with known and controllable properties (Ni/Cr with additives) is applied to a special ceramic substrate, resulting in a thermo-mechanic balance of forces. A resistive pattern is then photo-etched in the foil. This process uniquely combines the important characteristics of low TCR, long-term stability, non-inductance, ESD insensitivity, low capacitance, fast thermal stabilization, and low noise in one single resistor technology.

These include low tempco (0.05 ppm/°C ), tolerances as low as ±0.005% (down to ±0.001% when hermetically sealed), load-life stability of ±0.005% (50 ppm) with an  ESD immunity up to 25 kV. 

Check the link for more info
 http://www.vishaypg.com/foil-resistors/

Note: 30 MHz is not really considered a high frequency 



Foil Resistors may be an overkill for your application . They are expensive. Precision thin film resistors may be good enough. Here is a general comparitive table for your reference