not sure what you mean by 'standard signal' but if that means analog then with some exceptions for translator and low-power stations, American TV transitioned from analog to digital several years ago. if you have an analog TV in your RV you'll either need to add a digital-to-analog converter or swap out your old TV for a digital set.
do not be fooled...you will NOT need a digital TV antenna as there is no such thing. if you have the traditional bat-wing winegard RV antenna what you MAY need is the Wingman add-on. what the Wingman provides is additional receive capability on UHF channels. many, maybe most, TV stations that had been broadcasting in the VHF portion of the TV band are now broadcasting in the UHF portion of the band. all things being equal a UHF signal generally will not propagate as far as a VHF signal.