Dear DDavid,
You probably mean DC blocking capacitor to blocking DC. Bypass caps we use for decoupling power supply lines. Including DC blocking capacitor may be not easy on high frequencies due to intrinsic parasitic. Good DC blocking cap may cost about $3 per piece. Regular capacitors may have narrow bandwidth for low ESR and, therefore introduce series resistance and more parasitic into the circuit. As result return loss degrades and effective insertion loss increases whereas frequency bandwidth decreases. It is good idea to check ESR vs frequency plot for chosen capacitor before use it. The best is to obtain S-parameter file for this cap and simulate the circuit with it. Then you will get results close to actual and may make the final decision.
Best regards,
RF-OM