Using a mobile signal repeater to cover a parking lot involves several steps : 

1.assess the situation : 

Signal strength :check the existing signal strength in the parking lot .if there is no signal at all . a repeater won't work . you need a weak but usable signal outside to amplify . 

Coverage area : determine the size and layout of the parking lot to understand how many repeaters and antennas you might need . 

Regulations :make sure using a signal repeater is legal in your area . laws and regulations regarding those devices vary . 

2.Choose the right equipment : 

Repeater type :select a repeater compatible with your carrier's frequencies (3g,4g,etc)multi-band repeaters handle various frequencies but might be pricier . 

Antenna : you will need an outdoor antenna to capture the existing signal and indoor antennas to distribute the amplified signal throughout the parking lot .omni-directional antennas radiate in all directions ,while directional antennas focus the signal in a specific area . 

3.Installation :

Outdoor antenna : place it high up on a mast or the building exterior ,facing the nearest cell tower for optimal signal capture . 

Cable :use high-quality ,low-loss coaxial cable to connect the outdoor antenna to the repeater .keep the cable length as short as possible to minimize signal loss . 

Indoor antennas : distribute them strategically throughout the parking lot , considering the coverage area and the potential signal obstructions like concrete pillars . 

Repeater replacement :install the repeater indoors in a central location ,protected from moisture and extreme temperatures . 

4.System tuning and testing : 

Connect everything : securely connect the antennas and repeater with proper grounding to avoid electrical hazards . 

Fine-tune the gain :adjust the repeater's gain to ampify the signal without causing interference with the cell tower's signal . 

Test the signal :check for improved signal strength throughout the parking lot using different phones and carriers .

Additional tips : 

Consult a professional installer if unsure about the setup or regulations . 

Consider the long-term maintenance of the system ,including antenna cleaning and occasional gain adjustments . 

Remember ,repeaters amplify existing signals ,they won't create signal where there is none . 

By following steps and taking necessary precautions ,you can effectively use a mobile signal repeater to improve cellular connectivity in your parking lot , enhancing convenience and safety for users .