This eBay thing, can be very practical for our needs:
http://www.ebay.com/itm/50M-2-6G-10H...item337cb21a20
You can use it as field strength meter at the same time (measure field strength and frequency of signal at the same time).
If you replace antenna with meter cable (need to replace BNC connector on cable to proper UHF connector first). I have such one and use it as TX field strength meter on selected frequency.
I any case take some of hand-held version. I am very satisfied with PFM1300 from Thurbly Thandar Instruments (UK).
http://www.google.com/url?sa=t&rct=j...k6fagILwuMLu3g