[VHFcontesting] Relay Termination Loads

[kevinemtid at sbcglobal.net]

Hi Folks,
 
I have finally purchased 2 coaxial relays for my 1.2ghz yagi antenna setup. I see on the diagrams that a 50ohm load is needed on one side. My question is what should the required wattage be of the termination load? I see some loads for sale on Ebay (Narda 370 BNM) with a spec of DC-18Ghz 5 watts. Would these be sufficient if I plan to run no more than 250watts max? Most likely I will be only using 10watts from my Yaesu FT-736R but I do have a 250watt amp available. 
 
Thanks for your help!
 
Kevin NZ1I